Posted: Wed Jun 15, 2011 7:29 pm Post subject: Stopping and missing no codes
My wife has a 2000 impala 3.8 150,000 miles that is driving me crazy. I have changed everything I can think of but this thing keeps stopping and misfiring. It has the pass lock security but it does not come on, on the dash board. A mechanic told me if it was the key switch it would come on. Iíve had it to 3 different mechanics. Chevrolet changed the intake manifold $443.85 4/29/2010. That wasnít the problem, it staled coming home. They said it was the fuel pump 600.00 I changed it myself for $320.11 new factory pump the same one that was in it, fuel pressure good the same as the old one. That wasnít the problem, Ignition module 140.00 not it, Cam shaft sensor and the crank shaft not it, Plugs & wires not it, MAF sensor 145.21 not it. I took out the injectors cleaned them as well as I could and replaced the O rings on 12/30/2010 still missing or misfiring. Does anyone have an idea Iíd appreciate it. Thanks
Last edited by dbconn on Sun Jun 26, 2011 9:36 am; edited 1 time in total
Do you have power at the fuel pump? Meaning if I read you post correctly, you think you have power at the pump based on the relay, or have you physically checked. Can you swap the fuel pump relay with another relay that looks the same.
If you have power back at the pump, then the pump is most likely defective. You should also change the fuel filter as well. When you get it running, check the fpr, pull the vacuum hose off the top of the fpr, if it smells like gas, then replace.
The TPS, throttle position sensor does not apply because no fuel is getting to the motor. New parts can fail, or be defective.
Sorry it took so long didn't have time to check it out. I fixed the no start issue my fault I didn't have the fuel pump plugged in all the way in i guess, unplugged it to check for power (had power) plugged it back in and it started right up (duh). So back to my yearlong problem! Fuel pump and regulator I thank are OK with key on not running pressure is 50lbs, running at idle 43lbs book says 38 to 52lbs. Drove it 10 miles yesterday no problem at all, today 1mile it cut out on me (just like a miss) I turned around and came home.
Upper intake manifold or plenum
They said they found antifreeze around it so if it was leaking outside it was probably leaking inside also and that would cause a miss.
When this happens it does not set codes, no lights come on unless the engine stops, then the (red battery) light comes on, kinda like it goes to idle (coma) with the gas pedal pushed down as you would do for normal driving, you just cost to the side of the road, and sometimes it takes off before you get on the side of the road and dyes, but starts right up sometimes it takes a minutes or two.
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