ok well for some reason when my jimmy sits for over night or when it sits for a while it will have troubles starting but it is mainly in the morning that it has its troubles i have changed the battery, spark plugs and wires, fuel filter, idle air control valve,oil pressure sensor, crank shaft sensor, distributor cap and rotor, air charge temp sensor, starter, and i think thats it but can any one help me please its getting really annoying so if anyone know please tell me
1999 gmc jimmy hard to start?
- Thread starter Ricky
- Start date
I have a GMC Sonoma that had the same problem. The fuel pump eventually went out, then I bought a new fuel pump off of Ebay A Junk fuel pump from China for around $70 (brand new) when they normally run about $300 of and it ran great, for about two months, and now it started to have the same problem again, but I suspect its the cheap fuel pump starting to go out again. So basically, buy a decent fuel pump OEM or better and that should fix your problem. Also, It will only get harder to start, if you can't change the pump right away, get a can of starting fluid. One shot, it will start and run all day (until you let it sit)
Molson02536
New member
You could have a bad fuel pressure regulator and is leaking fuel in to the upper intake manifold. The other issue would be a bad fuel pressure check valve at the sending unit.
You can try turning the ignition keys on "engine not running" for 5 second and cycle it 3 times to prim the fuel line. If your engine starts better, then it's going to be a bad check valve at your sending unit
Good luck and keep us posted, you also post back what your fuel pressure is at the shredder valve. You should he 62-65 PSI to get the injectors to work 100%.