Cold Start - Fuel Injection?
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Joined: Dec 2002
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Cold Start - Fuel Injection?
Re: 1996 F-250 w/351
The past few mornings I've had trouble starting the truck. The engine turns over but will not start on it's own. When I press the pedal to the floor it starts no problem, but will not stay running when I let off the pedal altogether. Then after 30 seconds to a couple minutes then truck acts as if normal, and continues to start and run fine for the rest of the day.
Any advice?
Thanks! Ed
The past few mornings I've had trouble starting the truck. The engine turns over but will not start on it's own. When I press the pedal to the floor it starts no problem, but will not stay running when I let off the pedal altogether. Then after 30 seconds to a couple minutes then truck acts as if normal, and continues to start and run fine for the rest of the day.
Any advice?
Thanks! Ed
Senior User
Joined: Oct 2002
Posts: 194
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From: united states
Cold Start - Fuel Injection?
You might want to test, replace, or clean your idle air control motor. It is mounted on the side of the throttle body and could cause the symptoms you describe.:-X12
Posting Guru
Joined: Apr 2002
Posts: 1,471
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From: Greenwood In. USA
Cold Start - Fuel Injection?
I had a similar problem with the exception of it did it all the time.
I thought along the same line as the other responses. Long story short it was a bad distributor cap.
Hope this helps
Gasman
Do you have Gas?
Propane Execeptional Energy
I thought along the same line as the other responses. Long story short it was a bad distributor cap.
Hope this helps
Gasman
Do you have Gas?
Propane Execeptional Energy
Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
Cold Start - Fuel Injection?
You should read your codes before, during, anfter it has warmed up. The computer will tell you which sensors are out of range. This is the first step on any starting problem with a CPU controlled vehicle and will save you money and time.
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Cold Start - Fuel Injection?
the first thing you need to do is perform a full tune up, caps, rotors, plugs, wires etc. be sure to set the timing as well. maybe look into a msd ignition as it cured the cold starts on my 351w. change the fuel filter and check sensors. good luck.
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Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Cold Start - Fuel Injection?
I'd definitely agree with pulling the codes FIRST (many parts stores do it free), but it sounds like leaking injectors. Holding the pedal floored during starting triggers the computer to clear a flooded condition by NOT opening the injectors until the engine actually starts. The fact that yours runs rough if you let off while it's still cold also sounds like a flood, which on EFI could almost only come from leaky injectors. When the engine warms up, it can vaporize any excess fuel.
Or it could be a bad TPS, or something else... Pull the codes.
Or it could be a bad TPS, or something else... Pull the codes.
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From: Quaker Hill ,CT U.S.A.
Cold Start - Fuel Injection?
I worked on a 1992 or 1993 e150 with a 351w the engine had the same start up problems you are having . In order to fix the problem first unplug the negitive battery terminal then remove the the intake hoses from the throtlebody. (Check and see if the throtlebody has a sticker on it) If it does it should say NOT to clean it. Disrgard this at this time then remove the idial compensator from the throtelbody and clean it with throtelbody cleaner then remove the intake airtemp sensor and clean that too . The intake temp sensor is pretty cheap so I would recomend that you buy a new one. Install the new\cleaned parts reconnect the battery see if it runs correctly.
If it does then clean the throtle body opening and the throtle plates . Be sure to open the throtle and wipe out arounf the plates and where they close and seal to the t-body . Hope this works it did for me
Jon, 1989 F150 4X4
1975F100 4X4
If it does then clean the throtle body opening and the throtle plates . Be sure to open the throtle and wipe out arounf the plates and where they close and seal to the t-body . Hope this works it did for me
Jon, 1989 F150 4X4
1975F100 4X4
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
Cold Start - Fuel Injection?
Another thing you can check is the fuel pressure regulator. Pull the vacuum hose off the back of it and see if there is fuel in it. If there is, then the regulator should be replaced. This is a pretty simple thing to check, so it's worth a try. And yes, check the codes too.
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