GageBrand

I'm getting a code 22, I replaced the TPS sensor but I'm still getting a high idle and hard or delayed shifts, also I'm still getting a code 22.

aliceempire

iTrader: (14)

Did you adjust the TPS properly? https://www.thirdgen.org/forums/tech...t-tps-iac.html

You may need to trouble shoot as oppposed to throwing parts at it.
http://chevythunder.com/tps_code_22.htm

GageBrand

I haven't adjusted it yet so I will do that and see where it goes, could it possibly be a bad connection though?

GageBrand

So I adjusted it and it still is acting up, it goes away and then comes back, its been on and off when it decides to work and when it doesn't, while it was running I completely unplugged the sensor and there was no change in idle, basically it seems to me it is only registering the sensor sometimes. Could this be a bad wire or connector to the sensor?

aliceempire

iTrader: (14)

Did you follow the troubleshooting flow chart? It can help lead you down to which wire may be having a problem. It's also possible to have a bad ecm. First, figure out if it's a wire(s) and find out which one(s). I think these are the correct pin outs for your ecm, but I could be wrong....http://www.eecis.udel.edu/~davis/z28...5-870v8MAF.jpg

GageBrand

I'll try this chart, I've done quite a bit of troubleshooting and haven't gotten anywhere, I'm going to get my hands on a volt meter and test the connection. If it was a bad ecm wouldn't I bet getting codes for more than just one sensor, I have a brand new ecm in my 1989 RS I could throw in the Iroc but the RS is throttle body injection and the Iroc is TPI would that make a difference?

aliceempire

iTrader: (14)

The 85 TPI computer was a one year only thing. Many users stepped up to an 86-89 165 computer or a 90-92 7730 computer but you have to repin the harness to work correctly.

GageBrand

So I disconnected the negative battery terminal and adjusted the TPS sensor and still have a high idle and code 22, I'm about to hook up the volt meter to see what the voltage is, I'm stumped on what to do, I might go pick up a new ecm for it if I can get my hands on the specific one for the car, but if its not getting proper voltage I purchased a new connector for it so I will throw that on and see if that does anything , if not then i think ill have to re wire all the way to the ecm, if I pulled the ecm would an auto parts store be able to tell me if its faulty?

aliceempire

iTrader: (14)

No, they won't be able to test it.

GageBrand

Tested the voltage, positive cable to A and negative cable to B the first time I got .53 and now I'm getting .25 but I'm getting -.53 every time, never messed with these meters before so im assuming the voltage is low?

GageBrand

.25 ac volts is what I'm getting and -.53 dc volts

aliceempire

iTrader: (14)

0.53v dc is close to on the mark. Consensus is .54 is where it's supposed to be. When you have it hooked up open the throttle blades and make sure the numbers move smoothly as you open and close the throttle. If it seems ok move on to connections at the tps and ecm. Continuity of the wires should follow if the problem persists.

85Special

Ok have to jump in here, have an 85 IROC, been having trouble, odd little things biggest of which is the car wont start on its own, have to give it gas then all is well. It freaks out from time to time and the idle dives and sometimes cuts the engine. Totally freak occurrence, been through top to bottom, every sensor is checked or new, followed carefully the IAC set instructions. I have no codes, but still have gremlins.

It's a 350 swap, 87 computer and MAF, I have recently replaced the computer. I got the car post swap. So my main question is the harness to the computer need to be re wired? Or is there jumper pins in the computer that need to be re pined? May sound silly but re pin could mean either and it could be the basis of my problem.

I got the car when I was 18, I'm 34 now. While I was living in Alaska I left the car in a storage unit. Supposed to be a temp thing but before I knew it it had been 12 years. Ran like a rapped ape before I put it away, nothing but trouble lately. One of the things I replaced first was the computer, and I don't remember seeing any splices in the harness. So either I have wiring to do or the computer needs help? Yes?

GageBrand

I had to replace my ecm and the connector to the sensor to fix my tps issue, mine still idles weird but I reconnected my egr to the egr sylenoid and now I'm getting a check engine light for that so I'm assuming one of the two or both are bad which is causing the rough idle and bad startup