2000 excursion hard to start
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2000 excursion hard to start
Hello,
I have been dealing with my 6.8l V10 hard start condition for years now. It seems to have excessive cranking. Sometimes it starts pretty fast, other times it takes like 10+ revolutions till it starts. Sometimes if it cranks too much it will backfire. I have cleaned the IAC valve years ago and I think it helped a little, tried cleaning it again today but no real change in results. Plunger seems a little wierd to me, it does not sping all the way open but maybe that is normal? Cleaned carbon and it moves freely. Not sure if that could still be the problem or not, truck has almost 110k on it now. I changed the plugs around 50k. Routine maint. like air filter and oil changes. any thoughts what would cause periodic hard start conditions? It always will start but excessive cranking is annoying. Does not seem to matter if the engine is hot or cold. Thanks for any input.
I have been dealing with my 6.8l V10 hard start condition for years now. It seems to have excessive cranking. Sometimes it starts pretty fast, other times it takes like 10+ revolutions till it starts. Sometimes if it cranks too much it will backfire. I have cleaned the IAC valve years ago and I think it helped a little, tried cleaning it again today but no real change in results. Plunger seems a little wierd to me, it does not sping all the way open but maybe that is normal? Cleaned carbon and it moves freely. Not sure if that could still be the problem or not, truck has almost 110k on it now. I changed the plugs around 50k. Routine maint. like air filter and oil changes. any thoughts what would cause periodic hard start conditions? It always will start but excessive cranking is annoying. Does not seem to matter if the engine is hot or cold. Thanks for any input.
Laughing Gas
Joined: Feb 2011
Posts: 991
Likes: 6
From: Newberry Springs, CA
From what I remember the IAC valve does most of it's work when it's cold, and not so much when it's warm. So if you have the same issue when it's warm I'd look elsewhere.
It almost sounds like a timing issue, but I know you can't set the time on a V-10. I had a Mustang that did the exact same thing, but the timing was like 5 degrees off. When I reset it, it fired right up after that. If all your COP's are good, I'd start looking at some of the sensors, TPS, MAF, etc just to rule them out.
Sorry I couldn't be more help.
It almost sounds like a timing issue, but I know you can't set the time on a V-10. I had a Mustang that did the exact same thing, but the timing was like 5 degrees off. When I reset it, it fired right up after that. If all your COP's are good, I'd start looking at some of the sensors, TPS, MAF, etc just to rule them out.
Sorry I couldn't be more help.
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 24
From: Chino, California
Check the camshaft position sensor. It's located on the front of the block, driver's side just below the valve cover.
A faulty CPS could give a wrong reading to the PCM the position of the pistons so it does not fire up the spark plugs at the right time.
May want to check fuel pressure and injectors?
A faulty CPS could give a wrong reading to the PCM the position of the pistons so it does not fire up the spark plugs at the right time.
May want to check fuel pressure and injectors?
Elder User
Joined: Feb 2006
Posts: 545
Likes: 5
From: FL
Changing the fuel filter and getting a "fuel pressure readings "-both idle and under load -as suggested above- can eliminate some possibilities (like an acting fuel pump or bad pressure regulator ).
I think 6.8 V-10 engines have 2 camshaft position sensors -one for each bank, unless I am looking at something else at my v-10 on the front of the block . I have two sensors mounted there . Is this correct ?
I think 6.8 V-10 engines have 2 camshaft position sensors -one for each bank, unless I am looking at something else at my v-10 on the front of the block . I have two sensors mounted there . Is this correct ?
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New User
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I would assume a cps would through a code. This truck has been doing this so long I dont even know when it started. It does not matter if it is cold or hot of what I can tell. I changed the fuel filter and it did have some restrictions but same problem. what should the fuel pressure be? My manual does not say, think it said if it was over 85lbs then there was a problem but no specs. Im about to go on vacation so it will be a week till I can play with it again, thank you all for your input and anymore info would be greatly appreciated. Its no real big deal, it always starts but its annoying knowing it should start right up.
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