Bigfut Posted June 27, 2003 Report Posted June 27, 2003 OK, here's the problem tha both me and a repair shop can't figure out. I replaced the intake gasket, car ran fine for about 7 miles, then was only loading up and didn't want to run right. Got it home, same thing after it cooled, idles fine- put gas to it and it acts up and dies out. Ran diagnostic with both snap on and Genesis scanners, shows car is staying in closed loop at all times. Replaced O2 sensor cause thought it was coolant soaked and faulty. But now it is worse. Checked fuel pressure and its at 36 PSI, steady and consistant. Car will start, and run smooth and fine as long as its just idle. But give it gas and it loads up and dies out. wont restart til a scanner is plugged into it. with a scanner on it all the time will run fine about 15-20 minutes, then loads up and dies. Let sit for hour and repeats the process. I worked with it for almost 2 weeks trying to fix it, the repair shop has had it for going on 5 business days ... please help a newbie Quote
Slade901 Posted June 28, 2003 Report Posted June 28, 2003 Another clogged up catalytic converter. Check the cat or use a cat backpressure gauge. To use this gauge, you just remove the O2 sensor and plug this backpressure gauge and read the results. Quote
Bigfut Posted June 28, 2003 Author Report Posted June 28, 2003 no, it seems to have good flow at the tail pipe, but I'll have the shop try that Quote
kheider Posted June 28, 2003 Report Posted June 28, 2003 Replaced O2 sensor cause thought it was coolant soaked and faulty.. I hope that it was soaked with fuel. You should NOT have coolant in the exhaust downpipe! Checked fuel pressure and its at 36 PSI, steady and consistant. Sounds like the fuel pump! You would have 45 PSI if the fuel pump was healthy. Quote
ctx46 Posted June 29, 2003 Report Posted June 29, 2003 hmmmm.... gm says 32-45 is the healthy fuel psi range... unless mitchell on demand is lieing to me.. and if the intake gasket is leaking.. it can/will leak coolent into the motor, hence ruening the O2 sensors.... I agree with the shot cat.... run a back pressure test on it.... it should be anything highte than 2 lbs I believe... but I havnt ran one is s long that i forgot... lol later joe Quote
Bigfut Posted July 2, 2003 Author Report Posted July 2, 2003 ok, got it back today, they checked wiring, no excess back pressure, after putting wiring back in loom, it ran fine for the last few days. Got it back tonight and my elect system is REALLY low on charge, will test the system after work tomorrow and see hwats up now. Quote
lukee1982 Posted July 2, 2003 Report Posted July 2, 2003 Check the cat or use a cat backpressure gauge. To use this gauge, you just remove the O2 sensor and plug this backpressure gauge and read the results. where can you get one of these? Quote
Slade901 Posted July 2, 2003 Report Posted July 2, 2003 where can you get one of these? You'll find it at ebay.. or most automotive stores online. Quote
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