I have a new factory crate 5.7 with about 10,000 miles on it. It start up fine and runs like it is missing with a strong gas smell at the exhaust pipes. When I give it a lot of gas it starts to bog down like not getting enough feul,also when I run it high like this there is lot of smoking from the exhaust pipes,like the unburned gas is smoking in the pipes. I replaced the temp switch with no effect. Does it sound like the feul pump has had it. I let it sit around for almost a year and start it maybe once evey two weeks just to keep up the battery. Could this also be the problem,maybe clogged feul filter? Was hoping I could figure out myself. If the cat converter is plugged bad could it cause the engine to run poorly? Help? Please note I checked the tbi nozzles which both appear to be running well, I have also disconnected the pollution pump and am just running through the stock air cleaner which has been gutted, disabled the flaps etc in it so no air restrictions, could this be messing up the computer in someway? I checked the vacumn lines all seem to be connected ok and appear to be all right.
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
very poor running 5.7
- Thread starter subway21
- Start date
SUBFAN
1/2 ton status
What color is the smoke?
wildmouse216
1/2 ton status
You should pull a plug and see what it looks like. You could have blown a head gasket or cracked a head. Here is a quick tip start your engine and let it run for about three or four minutes at idle. Take a water spray bottle and spray some on the exhaust manifolds close to the head. If the water evaporates quickly there is nothing wrong with that cylinder. If it doesn't evap. you know there is no power in that cylinder. Maybe change oil to see if there is water in oil. Also could do a compression test. I would bet on a head gasket.
