Pasillas JonJon

I just got this camaro z28 1995 from my buddy he bought it with a blown head gasket and fixed everything himself and the things he didnt replace were spark plugs and wires. i replaced the plugs and half the wires (the passenger side is impossible for wires) and it got rid of a miss the engine had and replaced the check valves on the headers. i hear this high pitched ringing noise when i first start up the car and no SES light on while i hear the noise but as soon as the noise goes away the check engine light comes on. i dont want to pay my mechanic 90 bucks to just hook it up to a scanner tool has anyone ever had this problem occur or does anyone know what that high pitched noise is ?? its located towards front drivers side of engine by #1 plug. thank you!

jloshotz

Smog pump as a guess? You really need to scan for codes, or you may end up tossing parts at it for no reason. Good luck

Pasillas JonJon

how much do those smog pumps go for and are they easy to remove and install?

Pasillas JonJon

ive got an odb2 scanner and screamed and fought with it for a while to then find out its all odb1 but u need an adapter for the 16 pin on the 1 tool

RamAir95TA

You cannot scan OBDI codes with an OBDII scan tool, unfortunately.

Injuneer

Pull the harness connector off the AIR pump. Make sure there is a good fuse in the circuit. Will not set a code in OBD-I.

If the check valves were leaking, the exhaust has probably corroded the AIR pump pretty badly, explaining the noise,

Pasillas JonJon

well i took it to the smog shop to try and have them scan it for me and fix problems and the guys said that there is no libraries for the codes its throwing. they think the computer isnt for that car or there is a chip throwing codes its not supposed to throw. he said that he had to email a specialist for an opinion and then charged me for a couple more hours of labor and still hasnt come up with anything. he pulled the computer took the numbers and asked gm if the computer was right im still waiting on his call back. this guy juts sounds like a freaking idiot to me i am pretty pissed off and now i dont have my car for another day

Pasillas JonJon

my buddy threw in a nitrous gauge on the dual gauge holder on the a pillar and the shop said that there was previously nitrous in the car and it needs to be verified by california that its legal and i told him pull the gauge out its not even connected and he was like oh....well its jut a precaution we have to take and since he foudn that the heater hoses to the throttle boddy were bypassed he said they do that because of nitrous injection. i have no clue wtf this guy is talking about am i getting screwed???

moparman

The guy at the smog shop doesn't sound like he knows what he's doing. Hope you wrote the code numbers down so you can post them here. The car apparently had the throttle body bypass mod, which doesn't necessarily have anything to do with nitrous.

Pasillas JonJon

so what is the throttle body bypass mod? what is that for what does it do? I'm thinking about pulling the car and trying to get one of those monthly placards to just drive it around and see if the light will go away after a few hundred miles. again this car has roughly 200 miles on a new head gasket and the system is still burning off the crap from oil mixing with the water and having a misfire spill raw gas into the cats. i hope i can get the monthly placard but correct me if im wrong, isnt it if your car fails smog at a shop they have to do the repairs by law your not aloud to do them yourself anymore?

englundjd

the throttle body bypass is basicly unhooking the coolent lines that go to the throttle body and then hooking the 2 coolent lines together. Thus bypassing the throttle body. It add's a few horsepower because it helps keep the incoming air cooler.

I saw a dino graph on it somewhere and it did actually provide 6 horsepower if i remember right.

Injuneer

Many shops see the 16-pin OBD-II style connector, and assume its an OBD-II PCM, and use the wrong scanner. As noted previously, you need to use an OBD-I scanner with the correct 12-pin --> 16-pin adapter plug, or use jumper wires as Shoebox shows:

http://shbox.com/1/xraycable.jpg

Pasillas JonJon

reading CODE 62 oil temp sensor problem.... smog shop says there is no code 62 supported by the computer says vehicle does not have a oil temperature sensor

Injuneer

Probably be better if you posted a question in only one thread:

https://www.camaroz28.com/forums/lt1...95-z28-845729/

I've seen generic scanners report a code for the DTC 62. You phrased the question a bit differently in this thread. You could check the PCM part # and verify you have the correct PCM with the correct program for a 1995 F-Body LT1. It's conceivable that someone swapped in a Y-Body PCM, but the Y-Body 1995 PCM was OBD-1.5 and added an after-cat O2 sensor. Is he getting a code for that being missing?

shoebox

Three threads for this is making me dizzy.