Car will start up cold but will die after 1-2 minutes and not restart unless sitting for approximately 30-60min.
It will crank over but will not start.
It has spark and good fuel pressure (tested with guage & inline spark tester)
For giggles this morning I started the car with air filter lid off to observe if injector was indeed spraying fuel and sure enough no problem nice even cone.
Car idle ran a bit high at first for awhile until warm enough and eventually idled normally with a slight hiccup (hunting) for a sec but leveled out. WTF never shut off however. So while running I installed the air filter lid and sure enough a minute or two later car dies.
Is my assumption the catalytic converter is plugged/clogged?
Sounds like the normal airflow in to the throttle body has an obstruction. Is there a heater tube flap on that motor? Been a long time since I had a 2.5. But I would think a plugged cat would behave the same air cleaner off or on.
------------------ 86 GT built 2.2 ecotec turbo rear SLA suspension QA1 coilovers on tube arms
First time owning a 2.5 myself. Has a heater tube from exhaust up to air intake. Not sure about this flap but looks like something on top of the air intake that may be a flap.
Is this the flap? Is this accessible or repairable?
My cat plugged so I pulled the O2 sensor and that proved that it was the Cat or muffler causing the problem. Engine ran good enough to drive to the shop for a replacement.
Look inside the filter housing and see if that thermac flap is capable of closing off the intake. I think it probably isn't. The valve opens to pull heated air off the exhaust down-pipe when first starting in cold weather so the throttle body doesn't ice then it gradually opens to allow air to be pulled in through the side intake of the car as the engine warms and closes off the heated air from the down-pipe. But it's open to air flow in all positions.
The blockage is likely in the main air inlet from the side of the car.
My cat plugged so I pulled the O2 sensor and that proved that it was the Cat or muffler causing the problem. Engine ran good enough to drive to the shop for a replacement.
I've experienced this on my 85GT quite a few years back. I replaced it with a straight pipe ( for off road use of course!) and wow what a difference. Gas mileage went up 25%.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
Originally posted by thecage: Ok here is my situation.
1984 2.5 Auto - 69,000 miles
Car will start up cold but will die after 1-2 minutes and not restart unless sitting for approximately 30-60min.
It will crank over but will not start.
It has spark and good fuel pressure (tested with guage & inline spark tester)...
Likely is electrical getting hot and wait until cool again.
Pull the console, and tap ECM w/ fingers might show ECM problems. or change time to run because ECM Case is also Heatsink and has a lot of airflow now. Helps then get replace ECM, Move PROM to replacement ECM, See my Cave, ECM Heat
Exact what spark tester? Many time set wrong etc and seem to "pass" but ignition still have problems. Pull tach filter and leave it, See my Cave, HE Ignition and Ground "Myth" notes
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
Bad eggs smell is an indication of a cat getting clogged. Clogging is caused by car running rich so car goes into overdrive converting the extra fuel i the exhaust, gets too hot and melts.
Had that problem, car would drive ok at first then slowly loose power until it choked to death and died. Leave it a while and it would fire back up but even that got worse and worse as time went by. Suspect I have same problem again. Think I am just going to straight pipe it next time (no emissions here for pre 96 cars), or build me another and swap it in. Too much going on right now though for any of that!
------------------ Anything I might say is probably worth what you paid for it, so treat it accordingly!
I'm back to square one. This time it died idling even with air filter cover off.
Checked and cleaned entire air intake no issues there, thermac system is operational.
I did pull the O2 sensor and let it hang but car still died at idle after a couple of minutes. So i guess not a cat issue.
FYI what I have replaced with new last few weeks: Distributor with ICM & Pick Coil Dist Cap, Rotor, Plugs, Ignition Coil Set timing to 8deg with AB jumped IAC, TPS, MAP, EGR
I'm leaning now more towards ECM
Funny however that if I jump AB car will run and not shut off, doesn't idle as smooth but not terrible either. So shut car off, plug jumper AB and car restarted and did not shut off even after 10-15 min.
I'm going to leave car tonight and restart in the AM and see what happens.