well, are you losing any coolant? in your original post, you’d stated that a compression test was done and numbers were good. now, that doesn’t absolutely confirm that the head gasket hasn’t been breached, but it wouldn’t be my first suspect. also, those exhaust gas tests aren’t the most reliable .
check resistance of the ect sensor. first cold, then hot. see if it falls within spec
also, try cleaning the iacv. see if that helps. also, check the fitv
i mean, if the hg were leaking badly enough to cause driveability issues, you’d think compression numbers would be affected. and you’d be seeing some pretty harsh white smoke. but you’re saying with the rad cap off, engine running, you see bubbles forming in the rad? because that is a sign of combustion leakage. is the vehicle overheating?
from what you’ve described, i would still explore other possibilities first. checking the 3 things i’ve suggested won’t cost you anything but time
[QUOTE=welfare;2247320]well, are you losing any coolant? in your original post, you’d stated that a compression test was done and numbers were good. now, that doesn’t absolutely confirm that the head gasket hasn’t been breached, but it wouldn’t be my first suspect. also, those exhaust gas tests aren’t the most reliable .
check resistance of the ect sensor. first cold, then hot. see if it falls within spec
also, try cleaning the iacv. see if that helps. also, check the fitv
i mean, if the hg were leaking badly enough to cause driveability issues, you’d think compression numbers would be affected. and you’d be seeing some pretty harsh white smoke. but you’re saying with the rad cap off, engine running, you see bubbles forming in the rad? because that is a sign of combustion leakage. is the vehicle overheating?
from what you’ve described, i would still explore other possibilities first. checking the 3 things i’ve suggested won’t cost you anything but time[/QUOTE]
I will second this post. all really good info O.P. from your original post. sounds like a TPS issue even thought there was no CEL. looks like others have already suggested this…
Check the wiring to the TPS and the MAP. It just sounds like a sensor is giving the ECU bad readings. If you unplug the TPS what does the car do. If you unplug the map what does it do. Look at the write ups on this forum on how to check your IACV and FITV. It’s fairly simple. What about your fuel system? Have you check anything out with that? Fuel pressure? Manifold leaks around the O rings?
First of all thank you for all the response! Second I think I’m going to check all the things you guys are all saying the fitv, tps, map, iacv… I’m definitely down to tear down some to tear down some shit and do some mean cleaning! haha. If it’s not any of those things then at least they get a good cleaning. I’ll also check the intake manifold and the fuel injectors. I pulled the plugs and found just normal carbon on them, so the o2 sensor or distributor must have help
ed since they had gas on them last week.
Thanks again
Jason
Oh one thing, my wiring harness has definitely been messed with. Some wires have been wrapped together with something close to heat wrap and some have been electrical taped together so may be I’m in the market for a virgin harness… Since I have a 1990 would a 92/93 harness be compatible? B/c the local junkyard has a 92 or 93 and I believe it still has the harness in it
While your waiting you can always go through the wiring and take a look at what you have. It doesn’t hurt to familirize yourself with it anyway. You might be able to see what is wrong and fix it. If it’s a minor wiring problem just make the appropriate repairs and you will be golden. Good luck and keep us updated.
^^absolutely. i would go over all the connections you can find and properly repair them. either with solder, or the appropriate sized, non-shielded butt connectors, ratcheting crimping tool, and high quality heat shrink. the type with the glue insulation.
look carefully for any chafing as well. if the harness has been messed with, it may not be routed correctly which could lead to chafing
Does anyone know what this random wiring is? When I got my teg it had an alarm that didn’t work so we ripped it out and all the wiring (at least I thought I did). Is this alarm wiring? It goes to the distributor and some wiring goes by the fuel injectors.
Looks like alarm wiring. If im not mistaken. Alarms usually have wires that go to the distributor and the first or fourth fuel injector for a fuel cut situation. I could be wrong. The wiring in your hand is not stock for sure though. I have never seen braided wiring from the factory. Just trace them around and see where they go. All the engine wiring for the most part is going to run to the ECU. I think the only two that don’t are the engine coolant temp on the side of the head and the oil pressure.
also, i think obd1 used bulk head connectors at the strut tower, whereas non-obd ran them straight to the pcm. and the connectors at the pcm are different.
I pulled quite a bit of wiring out yesterday. I think I’m going to pull the motor to get the rest of the wire out and then I’ll re-wrap and clean up the harnesses and other issues while I do the head gasket.
hmmm. why you pulling the motor? and i hope you’re not basing a failed head gasket solely on the results of the co test. of course, it’s your time. just throwing my 2 cents at it
Yea I probably wont be pulling the motor. I just got antsy thinking about pulling the motor and cleaning it up lol. I’m going to first clean the fitv, tps, map, and the iacv.
