98 7.4L Hard starting

[sandy78]

I just bought this rig. 46000 on it. Has a "warm" start problem. Cranks but won't fire. If you crank it a small amount, then try again it always starts fine (but rich). I already resealed the plenum and retorqued the intake manifold. When I had the top off, I checked injectors, but they didn't appear to be leaking. It doesn't light up the check engine light. Hot start is fine. Cold start exhibits less of the warm start symptom (usually no trouble). I have not taken it to a dealer yet. Any ideas on obvious stuff I can check at home? Thanks!

 

[b454rat]

Don't know if this will help any. Buddy of mine works at a garage. Said alot of the GM's, after sitting for a bit, will loose the fuel pressure in the lines, and possibly injectors. Next time you go to start it when warm, turn the key to the on position, not all the way to start, just on, and wait a couple seconds, see if that does anything. My old truck did the same. It would crank over a few times, then start, let it sit few seconds and would start right up.

 

[MOABDADC22]

[ QUOTE ]
Don't know if this will help any. Buddy of mine works at a garage. Said alot of the GM's, after sitting for a bit, will loose the fuel pressure in the lines, and possibly injectors. Next time you go to start it when warm, turn the key to the on position, not all the way to start, just on, and wait a couple seconds, see if that does anything. My old truck did the same. It would crank over a few times, then start, let it sit few seconds and would start right up.

[/ QUOTE ] Yup!!!! /forums/images/graemlins/thumb.gif

 

[sandy78]

Update: Changed the fuel pressure regulator and the problem went away! It was a fuel pressure leakdown, just through the regulator diaphram and into the intake manifold. Thanks for the suggestions.