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cyrjm
Dodge Dakota
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8/21/2006
08:17:34

Subject: replacing a fuel injector on the 4.7
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how hard is it to replace an injector on the 4.7?



josh
Dodge Dakota
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8/21/2006
13:12:35

RE: replacing a fuel injector on the 4.7
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replacing an injector is not hard at all. get the fuel line quick disconnect and then remove the fuel lines to the rail. then remove the bolts that hold the fuel rail to the intake and then replace the injector. reverse the process to complete the job. that is the easiest way i found to do it.



Rob C
Dodge Dakota
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8/22/2006
03:00:02

RE: replacing a fuel injector on the 4.7
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Heck, don't even mess with the quick disconnect. There's enough slack, just remove all the rail bolts, don't forget to purge the fuel system first (it's got 49 PSI),lift up to pull the injectors out of the heads, remove the bad injector(s) and install the replacement injector. Don't forget to lubricate the O-rings, it'll help the O-ring slide into place without getting damaged or distorting and not sealing. You do not want to damage these O-rings, they're obscenely expensive. I use synthetic grease to lubricate mine. Once you have the O-rings lubricated, line them up on the heads and they'll slide right into place. Now you can bolt the rails down.
Here's a good price on the injectors:
http://cgi.ebay.com/ebaymotors/FUEL-INJECTORS-CHRYSLER-53032145AA_W0QQitemZ8060303258QQihZ019QQcategoryZ33554QQssPageNameZWD1VQQrdZ1QQcmdZViewItem
Good luck!



cyrjm
Dodge Dakota
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8/22/2006
20:54:13

RE: replacing a fuel injector on the 4.7
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the damn google ad colum is screwing up that last post so i'll post another question...i assume this is the right injector number? does anyone know the part number?



Rob C
Dodge Dakota
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8/23/2006
01:45:23

RE: replacing a fuel injector on the 4.7
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You have a 2001 right? I believe this injector PN 53032145AA will work for 2001-2003. You have the black and red injectors with the 2 large holes? Just put your mouse cursor to the left of the 'http' and click then hold down the 'shift' key and press the 'end' key. Now this should select the entire link so, do a 'ctrl c' then go up to the url line and click it then press 'ctrl v' and enter. This will take you to the link location. Good luck, I think you'll be surprised at the price for genuine Mopar injectors.



cyrjm
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8/23/2006
11:43:47

RE: replacing a fuel injector on the 4.7
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I actually have a 2000...can't imagine it'd be a different number?



Rob C
Dodge Dakota
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8/23/2006
23:21:06

RE: replacing a fuel injector on the 4.7
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Actually the 2000 used a different injector PN 53030842. They flowed less and were overrated at about 23 lbs (I think they really flowed about 19 lbs) that's why DMC switched them in 2001. They had 2 small holes and were so small they were difficult to see. I switched to the 2004-06 version PN 53032704AB. They use 4 medium sized holes and are rated at about 25 lbs as are the 53032145AA injectors. I actually bought 4 of the 53032145AA injectors brand new on eBay (that's all they had at the time). I figured they'd get more but after waiting for a year the 53032704AB were offered on eBay with only 3,000 miles on them. The previous owner put a supercharger on his 2004 4.7 Dak and went to hiflow FMS injectors. I'd be willing to sell the 4 I have for $45 (that's what I paid on eBay) and you can get the other 4 on eBay. $117 plus shipping is not a bad price for 8 new injectors that flow better than your old ones. I work in SLC so, you can inspect them before you buy.



cyrjm
Dodge Dakota
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8/23/2006
23:44:10

RE: replacing a fuel injector on the 4.7
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Hey Rob C...I might take you up on that. Did you notice an increase in performance at all when you upgraded to the high flow injectors? It seems you have seem some of my other posts...I'm in park city but am leaving town for a week. I'll take a look at ebay and see what i can find.



Rob C
Dodge Dakota
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8/24/2006
01:04:50

RE: replacing a fuel injector on the 4.7
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I noticed that it ran smoother overall, probably because the newer injectors have a better spray pattern. I seemed to have a power gain in open-loop mode. Like at WOT or when the engine is still cold. I think at all other times the fuel injection system tries to keep the fuel mixture at optimum level so, in closed-loop mode you don't have to worry about the engine running rich or your mileage dropping.
I also have the HO cams, 2004 intake, K&N FIPK II, Dynomax Ultraflo catback, no clutch fan and NGK Iridium sparkplugs. I was running a Robert Shaw 180 degree thermostat but had to pull it back out because at times the engine would run at 230 degrees or more. The factory thermostat uses a plunger to close off the coolant bypass port once the engine is at operating temperture and the aftermarket Tstat doesn't so your coolant is in full bypass mode causing the engine to run hotter.



cyrjm
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8/24/2006
08:12:09

RE: replacing a fuel injector on the 4.7
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I've been in Utah for 5 years and ever since moving from sea level I'll do anything to get my power back! I do have 33's now so that didn't help...

My truck threw a code at me for the number 5 injector and it's been itermitent for about 2 weeks...I'm only assuming it's the injector and not anything else. The engine light would go on and then off only running rough for a few minutes and then back to normal. Now I have a loud ticking noise somewhere on the left bank...bad injector?


Anyways, did you install the cams yourself? That's my next upgrade and I don't feel comfortable cracking open the engine...if you're in SLC I'd be willing to pay you to do it than some mechanic who's never worked on the 4.7.



Rob C
Dodge Dakota
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8/24/2006
14:40:41

RE: replacing a fuel injector on the 4.7
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The only way you're going to get the power back is to supercharge the engine. I went on a trip down to Long Beach and I couldn't believe the huge different the altitude made. That 4.7 really came alive!
Yeah, I did the cams myself. Working on the engine is pretty easy, I like the way DMC decided to use O-rings and reuseable gaskets in the engine. The diffcult part is getting all the crap out of the way so you can get to the cam covers. What made it easy for me was I used the auto hobby shop on Hill AFB so, I didn't have to supply all my own tools plus they put me in a stall next to a large work bench so, I labeled everything and was able to layout the parts neatly on the bench.
Have you looked at the injectors to see what color they are? The older injectors are black/gray, the 2001-03 are black/red and the current 2004-06 are black/green. Also, the part number is printed on the side. When you reseated the injector connector, you did the 3rd one back on the passenger's side right? When you ran injector cleaner throught the fuel system, did you run any lubricant with it, like Marvel Mystery oil? It's good to clean the fuel system but, many components need to be lubed too or they start to stick. A common problem is the ole "long crank times" before starting. That's usually caused by the checkball in the fuel pump sticking and letting all the fuel pressure bleed off back into the tank. A lot of times fuel injector cleaner won't unstick the checkball. I wonder how many people have bought new fuel pumps when they could've just lubed the fuel pump?



DakotaDave
Dodge Dakota
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8/28/2006
08:17:04

RE: replacing a fuel injector on the 4.7
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Rob C.

I have the 4.7l non HO motor.
Is it possible to use the injectors from the HO engine on my non HO motor?

What differences would i see?
I've been thinking of getting better injectors for my truck to see if i can get more HP and Torq out of it... Would this help any?

Thanks.

DD.




Rob C
Dodge Dakota
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8/29/2006
02:48:33

RE: replacing a fuel injector on the 4.7
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Yes, you can. Whether you'd see much of a performance gain would depend on what year 4.7 you have and what modifications you have. When DMC first started putting the 4.7 in their vehicles in 1999, they used weaker 23 lb injectors that realistically flowed closer to 19 lbs. The HO injectors are rated at almost 26 lb and supposedly aren't overrated and flow what they're rated at. Modifications like a better flowing intake and exhaust and HO cams help you take advantage of the better injectors. If you have no modifications to your truck putting in the HO injectors probably won't gain you much unless you have a 2000 and live in a low altitude area. Otherwise, you might see a slight gain at WOT.



DakotaDave
Dodge Dakota
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8/29/2006
19:07:29

RE: replacing a fuel injector on the 4.7
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Rob C. Thank you for your reply.
I have a 2005 Dakota and I live in Florida.

I have a True Flow Intake, JBA Headers, 70mm F&B TB, Flowmaster DF 40 SI/DO Muffler.

I wonder how much of a gain i'd get going with the 26lb injectors vs. the stock ones i have which i'm not totally sure what lb they are.

Thank you for your help...

Let me know what you think knowing this new info that i have supplied.

TY.

DD



Rob C
Dodge Dakota
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8/30/2006
03:44:15

RE: replacing a fuel injector on the 4.7
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I don't think you'd get any significant gain on the 2006 4.7, by 2001 they'd fixed the overrated fuel injector problem by going to better flowing 2 hole injectors for 2001-2003. In 2004 they switched to a 4 hole injector and are still using this injector. I don't think your injectors are not feeding your engine enough fuel. If you had a 2000 then I'd probably recommend the newer style injectors, either the 53032145AA('01-'03) or 53032704AB('04-'06).



cyrjm
Dodge Dakota
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9/17/2006
22:48:00

RE: replacing a fuel injector on the 4.7
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Hey RobC...hopefully you read this. I believe you said you're in Salt Lake City? Do you know any shops down there that will open up the engine? I had the dealer finally check on this problem, they did an overlay because supposedly this injector was a few OHMs (sp??) under spec. Well, aparently it didn't fix the problem and now I'm back at square one again. I went to a Burt Brothers up here in Park City and they said it's something internal, something's not seating right (can't rememeber what specifically). If that is the case, nobody up here will open up the engine. Anyways, if you read this and would like to shoot me an email: cyrjm@comcast.net

Thanks!



Rob C
Dodge Dakota
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9/18/2006
18:05:49

RE: replacing a fuel injector on the 4.7
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I thought you were getting a DTC for injector number 5? You had someone charge you $150 to do an "overlay"(I'm not sure what that is, sounds like they jumpered around the suspect wires?) which didn't fix the problem and now they're telling you it's an internal engine problem?
First of all, calm down and quit spending money. You're going to have to do some troubleshooting to narrow down the problem. I would suggest you do it yourself by opening the hood and removing the top of the airfilter housing, the intake tube and the air hat. Disconnect the injector connectors by sliding the red locks to the unlocked position and pressing the release. Depressurize the fuel rail by attaching a pressure gauge with relief valve and drain tube and draining into a clean container approved for gasoline(the preferred method) or get a small container(about 8 oz), a rag and something to press open the schrader valve. You're going to make a mess but, try to get most of the gas in the container. Remove the 4 bolts holding the fuel rail down (I think you might also have to unplug the coolant sensor near the front of rail because the harness is attached) and work the fuel injectors out of the heads slowly. Unclip the injector for # 5 and # 3 and swap the injectors. Now reassembly everything, remembering to lubricate the O-rings so they'll slide into the heads easily (otherwise you'll be fighting them and could pinch or tear an O-ring, they cost $80 a set and only the dealer carries them so don't damage them). Drive the truck normally and see if you still get the DTC for injector #5. If you get a DTC for #3 then you have a bad injector if it's still #5, then the dealer that did the "overlay" has some explaining to do. I don't see how an internal engine problem is going to point to the fuel injector. If the loud ticking wasn't accompanied by a DTC for the injector I might believe you have a bad lifter or more likely a cam follower out of place or damaged(the out of place condition usually doesn't happen unless someone didn't install it correctly in the first place).
One more thing, it would help to keep any crud from falling into your engine if you washed the engine before you started the procedure. Good luck!




Rob C
Dodge Dakota
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9/24/2006
11:36:58

RE: replacing a fuel injector on the 4.7
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cyrjm, what's going on with your truck?



cyrjm
Dodge Dakota
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9/24/2006
12:12:04

RE: replacing a fuel injector on the 4.7
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Apparently I didn't get the email from your previous post...thanks for the info. I'm pretty relaxed about the whole thing...just concerned that it may turn out to be something way more expensive. I went back to the dealer and they were very cool with me...talked to the technician who did the overlay. I drove my truck up and down the highway a few times to get it warmed up in the hopes of recreating the problem. Well, it didn't..until I left but they knew what I was talking about. They think it could be the injector or potentially the PCM which I've actually seen on this forum. First guys will have a problem with one injector...then the next...and then the next and they said the PCM just sh!t the bed.

Sooo, instead of them charging me to do what you recomended I'm going to swap out the injector and see what happens. Because the engine only misfires when it's warm I'm thinking that the heat is somehow affecting the solinoid? However, when I'm driving it and it's warmed up to normal operating temps nothing goes wrong. Only when I stop and restart it does it cause problems. The technician said it has to be something electrical because that's what the code indicates. If it is in fact the PCM then why only this injector?

A question for you..where can I get a pressure gauge with a hose and relief valve to depressurize the fuel rails? Also, what lubricant should I use for the O rings?

Thanks for your time Rob C...much appreciated!



Rob C
Dodge Dakota
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9/25/2006
20:23:52

RE: replacing a fuel injector on the 4.7
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I bought a my pressure gauge at AutoZone for about $35 but, it's been a few years.
I just use a dab of synthetic bearing grease but, you can use silicone grease or standard bearing grease too. It's only purpose is to help the o-rings slide into the fuel rails and heads without distorting, getting pinched or out of position. You want those O-rings to seal, once everythings in place, the grease isn't needed.
The reason that it's possible to be the PCM is because the PCM uses a different pin for each injector. As a matter of fact it's connector 2 pin 6 that controls injector 5. You might want to get some electrical parts cleaner and pull the the PCM middle connector and spray the pins and connectors then reseat them. (First disconnect the battery before doing this.)
However, since your getting a ticking sound it's probably a mechanical binding problem with your injector.



kevin
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8/30/2010
18:04:59

RE: replacing a fuel injector on the 4.7
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i have a 05 durango and the check engine lite is on code reeds random missfire i cahanged plugs and coils on number 3 and 5 but i noticed my injector seems to be crcked and larger than the rest of them it a 4.7 by the way how hard would it be to change its the drivers side second one back from front ithink the cylinders are 1 3 5 7 front to back number 3 is the one HELP!!



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