How to get codes from check engine light

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Aug 11, 2010 | 10:58 AM

classic79

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How to get codes from check engine light

Engine 2002 4.8 out of a silverado into a 89 burb 2wd with 700r4.

Is there a way to pull off any codes from the computer without a scan tool? I could pull them up before using a jumper wire and counting the CEL lights flashes with the old computer. Can I do it with the new puter setup?

Hooked up the CEL and it is coming on. That and it idles high now that I put a mass air meter on. Before I put the mass air on it idle fine. Of course now the computer is hooked on the mass air like meth and won't run without it hooked up.

I already tripled checked for vacumn leaks, found one cracked hose fixed it, but still same problem of high idle.

Anyhelp would be mucho appreciated!!

thanks
chris

Aug 11, 2010 | 11:33 AM

eastcoastbumps

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From: Central MA

Chris, you'll need to get your OBDII port working. You can get a flying lead off a car in the junkyard or buy a new one. Its a 4 wire hook up. Constant 12V, engine ground, chassis ground and data from the ECU.

Pete

Last edited by eastcoastbumps; Aug 11, 2010 at 05:02 PM.

Aug 11, 2010 | 03:30 PM

nissan 570sx

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From: Maine

Right in one of the sticky threads up top.

Aug 11, 2010 | 08:04 PM

classic79

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but even with the obdII port do I need to buy a code reader? or is there a way to pull the codes like obdI did.

Aug 11, 2010 | 08:55 PM

nissan 570sx

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From: Maine

Quote:

Originally Posted by classic79

but even with the obdII port do I need to buy a code reader? or is there a way to pull the codes like obdI did.

You can just swing in to Autozone or the like and have them pull the code for you if you don't have access to a scan tool.

Aug 12, 2010 | 07:00 AM

Pop N Wood

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I think they got rid of the blinking CEL light like some of the OBDI systems use to have. A code reader is much nicer than counting flashes anyway.

Harbor Freight use to sell a code reader for $30. I have one and it works great. Notice the cheapest one they have now is on sale for $50. Looks like it does a little more than the one I have, although don't know why being multilingual would be desireable. all I want is the number codes.

http://www.harborfreight.com/can-obd...enu-98568.html

+1 on the autozone idea

Aug 12, 2010 | 08:54 AM

classic79

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I think I will see if I can find one at Harbor freight local then. Thats a good reason to buy another tool.

One a positive note I fixed my high idle, the throttle cable I used was off a 96-98 vortec tahoe and as just a little tight in the throttle bracket. Elongated the holes to move the bracket just a hair and now it idles normal again. Yeah for cheap fixes!