HELP! Really odd problems...

[chevyboy831]

hmm... electrodes look good.... a lazy o2 sensor definately sounds like its part of your problems. adjusting the tps might help. have you done any timing adjustments? ermember you have to disconnect the brown wire at the firewall to do so or else your timing is goint to b way off. if its running rich the voltage on the o2 will read low. youwont get a code for the tps on this obd1 unfortunately. when they go, they go and its hard to do a simple resistance test on em. you need to run a graph with a scan tool to look for imperfections in the sweep to see if you have a dead spot.

---------- Post added at 11:34 AM ---------- Previous post was at 11:29 AM ----------

WAIT WAIT WAIT!!!!! You fixed the exhaust leak, did u reset the computer? touch the battery cables together for 10 seconds to reset the learning curve then drive.

 

[TighTheChevyGuy]

okay so i threw an O2 in it and now its way worse hah. put a bosch O2 in it. its now dying whenver it pleases. also, apparently i set the IAC wrong. so tomorrow i do believe im gonna test the TPS and then try this wire trick. just disconnect them from the battery and then hold the cables together??? never heard of doin that lol. ive made a lot of changes in two weeks (most mentioned in original post) so it could need some resetting lol. the ECM is only about a month old though. and i havent looked into any timing stuff yet. could it bounce in and out of timing? because sometimes it runs absolutely fine

---------- Post added at 12:17 AM ---------- Previous post was at 12:16 AM ----------

also, when i do the resistance test, which wire is what? its the 3 lead connector.

 

[fire730]

Did the o2 come with a factory plug or was it just wire leads that you had to connect to the OEM plug?

 

[TighTheChevyGuy]

just the wires. plug looked okay though. should i return it and pay the extra ten bucks for NTK instead of bosch? the NTK comes w a new plug and seems to be built a bit better

 

[fire730]

Return it. Bosch makes some good things but O2s and spark plugs are questionable.

The reason why I asked is because I had a customers car that had O2s replaced with ones without plugs. After running for about 5 minutes it would run like crap and basically drop half of the cylinders. I unplugged both upstream O2s and the car ran great. I replaced both O2s with pre wired ones and it's been driving great. I never did go through the hassle of figuring out if it was crappy universal O2s or if they were wired wrong. This was an 02 Mitsubishi Eclipse V6.

 

[geo3xk]

Have you checked the egr?

 

[TighTheChevyGuy]

it sat at a shop for about a month since im short on tools and whatnot so my buddy mike let me use his shop to work on it and we just plugged the vacuum hose that goes to the egr.

and thanks fire, ill return the bosch and spring for the ntk and see it that helps any. gotta go to work tho ill let ya know when im off. also supposed to test the TPS today, hopefully.

also noticed something in another forum about the injectors dumping fuel.. i looked into it.. mine are dumping fuel like crazy. maybe a fuel pressure regulator rebuild?

 

[SunlitComet]

Do not use anything other then Delphi or acdelco Oxy sensors on a one gm vehicle.

 

[farwek]

I had this problem on my 99 Yukon and it kept giving codes for the o2 sensors. I figured it out yesterday the battery cable on the positive side was not getting a good connection so all I had to do was take off the rubber sleeve and it fixed my problem of the last two years... and no more ses codes. Also I always had enough power to start and run but it was causing just a small enough problem.

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[TighTheChevyGuy]

took the bosch O2 out and it was scorched all around the base. after driving maybe a half hour total with it. and i prefer acdelco parts but we didnt have one in stock. although my battery cable is definitely corroded where they spliced it to put a system in it...

i also noticed that it doesnt get up to temp... it stays right at about a quarter of the way up (between 100 and 210) but i just put a temp sensor in it about three weeks ago... maybe the pigtail is bad? because i know that has a lot to do with fuel delivery...

also the plugs on the drivers side are getting worse. 1 is not bad, 3 is a lil darker than a cream color, 5 is brown, and 7 is almost black on the porcelain.

i just bought a TB rebuild kit, but it didnt come w a new FPR... and i hooked my egr back up but that hasnt helped any, and also unhooked the battery to try n reset the computer.

someone asked how it runs cold... it throws a lot of smoke right on start up, like the TB is flooding or its putting itself into clear flood mode to start...