Mechanic replaced my old throttle body with a lightly used throttle body. ALso installed a new O2 sensor. ECU is still throwing an error 7 & 15 and the car continues to stall at lights and sputter in 1st & 2nd gear. Runs great on the highway and around town but when you stop you got to keep the motor rev'd up to keep it from stalling. Mechanic said the throttle body tested good and should of solved my stalling problem. It appears to be similiar to some of the problems I've read here and I'm wondering if anyone can point me in the right direction for troubleshooting. Thanks!

txgreasemonkey

1. Your main problem is that you need to install a new igniter. Be sure and coat the back of it with silicone grease, before installation.

http://www.askmehelpdesk.com/cars-tr...tml#post265896

2. If the condition doesn't go completely away, replace the Throttle Position (TP) Sensor.

If you plan on keeping the car, this would be a good time to replace the coil and rotor.

poohpotta

Well, I took your advice and ran to AutoZone to purchase the igniter. I let the AutoZone guy talk me out of it though as he suggested to check my vaccum hoses. Since the igniter was $69 and unreturnable, I thought I'd run the vaccum question by you first.

txgreasemonkey

I would go back to Autozone and ask them to check your old igniter and coil for free, which they will do. I don't know what a Code 15 (Ignition Output Signal), however, has to do with vacuum hoses. So go ahead and check your vacuum hoses, which I don't think is part of the problem, and then get them to test your old igniter and coil. Because of the age of your Civic, I recommend that both of them be replaced. I recommend replacing them every 120,000 miles or 10 years, whichever comes first. My best analysis from afar, though, is that you at least need a new igniter.

After doing whatever you are going to do, reset your computer by pulling the BACKUP fuse in the under-hood fuse box for 10 seconds or disconnecting the negative battery cable.

poohpotta

Good point, I'll pull it out and take it down to get test and let you know the results. The mechanic said he didn't reset the computer after replacing the throttle body. I checked the codes tonight and it is still flashing the 7 and 15. Interesting thing I noticed is that the CEL no longer comes on when you turn the ignition to the on position. Is it possible the mechanic disabled this light?

txgreasemonkey

I doubt that he would know how to disable it and still allow your car to start. Go ahead and reset the ECM on your own and retest for any codes.

Did the mechanic set the throttle cable and idle rpm properly, after he replaced the throttle body?

poohpotta

I called this morning and he says they set the throttle cable and idle rpm, but he's always wishy-washy when answering questions so who knows. I did verify that he did not reset the ECM. Will it continue to flash the throttle position error (7) even after replacing the throttle body with a known good unit?

txgreasemonkey

Yes, codes 7 and 15 are stored in the computer until it's reset. Just go ahead and disconnect the negative battery cable for 10 seconds and clear the computer.

poohpotta

I went by AutoZone to pick-up a part I ordered for my 90 Prelude (VSS, go figure) anyhow I asked if they could test my igniter. The manager told me they had no way to test the igniter. Is there anyway I can test it myself once removing it from the car?

txgreasemonkey

It's called a Well's Machine and most Autozone stores have them. Here's are the free services AZO advertises they can perform:

AutoZone.com | In Our Stores | Free Testing

Bench testing this component with a DMM is almost a waste of time.