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Code Help
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Posted by: Tang

Ok, here are the codes my car throw

Key on,Engine off: 21 and 54

Key on, Engine Running: 98 and 54

I've already changed the air charge temp. sensor, and it never quit throwing 54. I put new O2's on it last year.

Any help is greatly appreciated. Is that Superchip module that goes between the harness and the EEC causing it to run in failure mode ?

This is why I think I'd rather have a carb

Posted by: Grape Ape

Don't you have the little book to ge the answers to each code? Mine's already at the new place, so I can't help ya there. O2's can go bad in an instant, so they may be a problem now. Maybe it's the AIC motor going, or some other stinking emissions related garbage my car doesn't have anymore. :btg:

I'll prolly have to deal with this stuff again soon though, since just snagged a 95 Mercury Sable a couple days ago. Runs fine, no check engine light YET...

Posted by: Giz

my ck engine comes on on my E250 so I stop and lift the hood and it's still there??

Giz

Posted by: DeckSetter

Quote:


	Originally posted by gremlin406 my ck engine comes on on my E250 so I stop and lift the hood and it's still there?? Giz

Posted by: Tang

Yes, I have the book. Also I performed these tests on my MAF.

VPWR and PWR GND test:

Turn key to OFF position. Disconnect MAF sensor from harness connector. Set VOM to volts and connect VOM between VPWR and PWR GND at harness connector. Turn key to ON/RUN position (DO NOT start engine). VOM should display +10.5v or greater. If not, connector or VPWR circuit or GND circuit to battery may be faulty.

MIne showed 12.1 volts
------------------------------------------

MAF circuit short-to-ground test:

Turn key to OFF position. Disconnect MAF sensor from harness connector. Set VOM to Ohms and connect VOM between MAF SIG and MAF RTN, and between MAF SIG and GND (two separate tests) at harness connector. VOM should display 10,000 Ohms or greater. If not, connector, wiring to ECA, or ECA may be faulty.

First test listed mine showed 140,000 (not a typo), and the 2nd test showed 110,000
-----------------------------------------

MAF sensor voltage test:

Connect MAF sensor to harness connector. Backprobe MAF sensor connector harness with VOM between MAF SIG and GND. Start engine. VOM should display +0.2 - +1.5v DC at idle. If not, MAF connector or sensor may be faulty.

MIne showed 1.05 volts
____________________________________

I unhooked the battery cable for 5-6mins, installed the factory MAF. Started the car and let it get to normal operating temp, then tested it again.

KOEO - it just throwed 54 this time

KOER - It throwed 98 and 54

All my voltages and ohms checked out. I'm gone to pull that Superchip module out and see what happens.

By the way, my factory tach still stays on 4k rpms when the car is running, and will hardly move up at all.

Then took the Superchip Module out.

Without it, it throws codes 12 , 41, 33, and 91.

Which infact says the superchip module is causing the failure mode (code 98). But this thing seems to be full of problems.

And check the pic to see the Superchip thing I keep talking about.

Posted by: StoneFox

My NotchBack always had a check engine light on because I blocked off the EGR. I just took the bulb out

Posted by: Tang

I took the bulb out of mine too.

I'm just affraid with all the errors, that it wont run very strong. What do you think this thing should run in the 1/8 ? Im gonna take it anyway like it is and see what happens.

'92 Mustang GT
B-303, 73mm C&L MAF, 70mm Edelbrock Throttle Body,
Cold Air, Superchip, Gutted Cats,
Turbo Tube Cat-Back, 3.73's, Hays clutch,
Hurst Billet/Plus, Accel cap and wires

Hoping for atleast 9 flats at atleast 80-82mph

Posted by: StoneFox

Depends on if you can hook, and what kind of air you have. Probably 8.7s to 9.0s

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