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ANDE
Dodge Dakota
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12/05/2003
00:08:08

Subject: Rough Cold Start
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My 99 318 starts up every morning, BUT as soon as the engine fires it will run sorta rough for a second or two and then smooth out to a nicer idle. No real loss of power though...

Ive checked everything I can think of and havent been able to find anything wrong. No Check Engine light, Plugs are fine, IAC is clean, Belly Pan gasket was replaced a year ago- (no oil consumption). I even sprayed carb cleaner down the throttle body but no fix!
After the engine is at operating temp it runs fine and will start right up and hold a nice idle immediately.
Hard to explain it really but you can really hear it in the exhaust note when I start the truck when its cold (Cat-Back Dual Exhaust), Sounds kinda like I have a big cam installed, then after a second or two it will sound like its firing on all eight (normal).
Im really wondering if anyone else has had this kinda problem in the past and what they did to fix it. Id like my truck to start with the gusto it used to have when it was newer.
I know it used to fire right up smoothly in the mornings and jump up to about 1,000 rpms then settle back down to about 800 rpms. Lets just say now it doesnt do that when cold, now it starts up and works its way up to 800 rpms.
Almost as though my truck just doesnt have the gusto to get up and running in the morning but roars to life when warmed up.

Sorry for all the repetitive text, but the symptoms are kinda hard to expalain without witnessing it in person.

Any one have any ideas?

ANDE





slow318
Dodge Dakota
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12/05/2003
08:19:58

RE: Rough Cold Start
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I have a 99 also with the exact same thing and I havent been able to figure it out either.



01Motorsport
Dodge Dakota
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12/05/2003
08:57:44

RE: Rough Cold Start
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Your injectors may simply be a little dirty. Try a bottle or two of STP concentrated injector cleaner (black bottle) in the tank. I've used the stuff on a variety of vehicles over the years, and it works great. About every 6000 miles.



ANDE
Dodge Dakota
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12/05/2003
14:26:31

RE: Rough Cold Start
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Ive tried Injector Cleaner,,,no luck.
anymore ideas?
Bad Sensor somewhere maybe?

ANDE



Dave Mitchell
Dodge Dakota
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12/09/2003
15:09:36

RE: Rough Cold Start
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The dealership flashed my PCM for $137.00 stating it was and adjustment, and therefore, not under warranty. Then they told me my battery was a goner and that woudl be $130 more, and that the throttle body needed cleaned and that woudl be $85.00. So I bought the battery from parts department for $79.99 and installed it in their parking lot. Bought a throttle body gasket and cleaner and cleaned the IAC and throttle body completely.

The problem is still there.

I am going to tell them to do a fuel rail pressure and leak down check. It coudl be an injector sticking and leaking the pressure into a cylinder, or the check valve in the fuel pump/regulator module is leaking down.

Mine tends to stall during cranking as though it is hydrolocking on a cylinder. I may want them to check the cooling system pressure and compression on all cylinders for this.



curious
Dodge Dakota
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12/12/2003
18:18:51

RE: Rough Cold Start
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You dont happen to have Autolite # 3923's installed do you.?



Dave Mitchell
Dodge Dakota
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12/20/2003
12:25:58

RE: Rough Cold Start
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Nope. I have the specified plugs as called out in the factory manual. I think my problem may be a fuel injector is leaking down and puddling a cylinder with gasoline. Smells like unburned gasoline at first start up when this happens. Have to get it in soon, though, 73,000 of the 75,000 mile extended warranty I paid for are gone.



Sephiroth
Dodge Dakota
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12/20/2003
21:32:53

RE: Rough Cold Start
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Let me guess, you start your truck right up and drive? Mine throws a fit when I did that once (was in an emergency hurry, promised I'd never do it again). Now I go down, crank the truck and lock the doors, go back up and finish getting ready for work (brush teeth, comb hair). When I go down the truck is generally warmed a little, the needle usually between the first mark and the second mark that has the line to the third mark. Now I get in (using my second key which stays in my wallet for emergencies) and drive off. No noises at all. The truck is a '95 CC 4x4 with the 318 in it. I've switched to the cooler orange coolant and dropped in a 180deg thermostat. The truck has a hair over 103k on it, original parts. I suggest you get up about 10min early one morning, crank your truck, and let it warm to at LEAST having the needle past the first mark on the temp gauge. If your truck then doesn't give fits, you know the problem.

On a side note, before I got all engine-savvy and started upgrading my Daks, my '92 V6 CC 4x4 Dak would completely stall as soon as I slowed or stopped if I just got in, cranked it, and drove. I see a LOT of people do that and it is NOT good for the engine.

Finally, stay away from STP or other fuel-cleaners with detergents in them. They clean up your system, but also shorten it's life. I use Redline in my truck for this reason. It's got no detergents and does no damage to the fuel-system. In fact, it is SO mild, that you can use it in every tank, even if you fill-up twice a day! However, I use it once a month on my trucks, and it keeps them running fine. The stuff comes in a bottle no bigger than the STP or other additive bottles, but each Redline bottle treats 100gal of fuel, and is marked in 10gal increments. I've only found this at Pep-Boys, and here in Raleigh, the stuff is gone within a day or two of the truck comming. It rocks!



PKDAK
Dodge Dakota
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12/21/2003
13:01:45

RE: Rough Cold Start
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I had that problem and a friend at my dealer found a tsb to reflash the pcm. Problem solved at NO COST !!



ANDE
Dodge Dakota
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12/23/2003
18:08:14

RE: Rough Cold Start
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Update:
Just to rule out the possibility of a cylinder with low compression I performed a compression test on the engine (cold). I found all 8 cylinders showed between 175 to 180 psi.
So,,,that said I just dont think it could be compression related....
I also dont seem to be losing fuel pressure from the fuel rail overnight as i can get a pretty good spirt of gas from it after an overnight sit.
Could a fuel injector fail to the point that it will maintain pressure when the engine is off but still not deliver the right amount of fuel to initiate a clean burn in the cylinder when the engine is fired? And why would this symptom seem to clear up gradually as the engine warms?

STUMPED,,,but annoyed by this little problem.

ANDE



John Slagel
Dodge Dakota
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1/20/2004
13:30:54

RE: Rough Cold Start
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I had a similar problem, fixed it by replacing the distributor cap & rotor. $10 or so and about 1/2 hour of time.




5.9quad
Dodge Dakota
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1/20/2004
15:57:03

RE: Rough Cold Start
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Hi there, I have a 00 Quad cab with the 360 in it and when its cold out it seems to like kick back when starting it. also ive noticed that when u take off and its still kinda cold the motor lurches like got a dead spot kinda a crappy sound idk if its somthin i can fix or if its just the 360s are cold blooded a bit. ????



EBL
Dodge Dakota
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1/20/2004
16:02:57

RE: Rough Cold Start
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John's advice above is good advice. You also might want to replace the wires. Checking the gap on the plugs wouldn't hurt also.



Dave Mitchell
Dodge Dakota
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1/26/2004
11:28:28

RE: Rough Cold Start
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I forgot the 360 and 318 and the V-6 have a distributor and wires. As John said, check the distributor. Perhaps the inside of the dsitributor cap has moisture in it? Or the wires, perhaps? Also ensure the holes in which the plugs are recessed are clean and the plug insulators and caps on the wires are clean to prevent arc over.

With just 244 miles on the extended warranty I purchased, I took my truck to a different dealership and quoted the factory service manual. They replaced the fuel pump to fix my problem.

Mine would start okay if I turned the switch to ON position three times for 3 seconds each before cranking.

My extended warranty has bought me a new manual transmission and new fuel pump. I wonder if it was worth it, after financing?

Oh well, the truck is running good again... Just worried about the ball joints, now.

Dave




Toomstone
Dodge Dakota
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1/26/2004
15:59:08

RE: Rough Cold Start
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Ande,
I had the same problem on cold mornings. It had to be below freezing. If it was warmer it did not have a problem. I would start it and it would kinda stumble and miss at idle and it would have to warm up before I could take it anywhere. After changing the plugs, wires, cap and rotor, fuel pump I finally got a check engine light. It was an 11. It was the crankshaft position sensor. I changed it and its been great on these cold mornings.

Hope this helps




AmsoilSponsor
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1/26/2004
22:01:17

Amsoil helps prevent rough cold start
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Okay ... I know this is Off Topic - don't FLAME me - maybe it helps someone.

Since the topic is COLD WEATHER STARTS ...

The lower a lubricant's cold crank viscosity, the easier an engine will turn over in cold temperatures.
__________________________________________________

API Comparative Motor Oil Testing

AMSOIL Synthetic 10W-30 Motor Oil (ATM) and 10 competing conventional and synthetic10W-30 motor oils were subjected to a series of API motor oil tests. The competing oils included petroleum-based Castro GTX Drive Hard, Mobil Drive Clean, Pennzoil with Purebase, Quaker State Peak Performance and Valvoline, as well as synthetic-based Valvoline Synpower, Quaker State, Castrol Syntec, Pennzoil and Mobil SuperSyn Multi-Vehicle.

Seven API tests were run on the motor oils. The Thin-Film Oxygen Uptake Test (TFOUT) measures the oxidation stability of engine oils. The High Temperature/High Shear Test (HTHS) measures a lubricant's viscosity under severe operating conditions. The NOACK Volatility Test measures the evaporation loss of oils in high temperature service. Pour Point indicates the lowest temperature at which a fluid will flow. Total Base Number (TBN) is the measurement of a lubricant's reserve alkalinity for combating acids. The Cold Cranking Simulator Test (CCS) measures a lubricant's viscosity at low temperatures and high shear rates. The Four-Ball Wear Test measures a lubricant's wear protection properties. The impressive test results show AMSOIL Synthetic 10W-30 Motor Oil outperformed the competitors in each test.

Since the topic is COLD WEATHER STARTS ...

I will only discuss Cold Crank Simulator (ASTM D-5293)


The Cold Crank Simulator Test determines the apparent viscosity of lubricants at low temperatures and high shear rates. Viscosity of lubricants under these conditions is directly related to engine cranking and startability. The lower a lubricant's cold crank viscosity, the easier an engine will turn over in cold temperatures. 10W motor oils are tested at -25C and must have a viscosity below 7000 cP to pass. AMSOIL Synthetic 10W-30 Motor Oil is well below the maximum requirement, while many of the competing oils barely pass.

The low cold crank viscosity of AMSOIL Synthetic 10W-30 Motor Oil reduces drag on moving engine parts and allows engines to achieve critical cranking speed in extremely frigid temperatures. Engines turn over quickly and dependably in the coldest winter temperatures.
__________________________________________________

Maybe this helps someone --- it is frigid outside.

Request a FREE Amsoil catalog by clicking the link below:



Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com

AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products



Vern
Dodge Dakota
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1/28/2004
09:04:21

RE: Rough Cold Start
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Any of you guys ever tried Sea Foam? My brother told me about it. That stuff is gold for fuel systems!



Dan
Dodge Dakota
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5/25/2004
13:59:17

RE: Rough Cold Start
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I had a similar problem with cold starts. It turns out my battery was weak and on the way out. I would start the truck in the morning and it would barely idle. I would then turn off the truck and start it again and it ran fine.

The problem went away after the battery totally died and I bought a new one. I never would have figured that a battery would have caused a rough idle, but it did!

1997 dakota 4x4 318v-8



Ritter18252
Dodge Dakota
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4/13/2019
08:19:26

RE: Rough Cold Start
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Ande did you ever solve this issue



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