I had the check engine light come on last night and when I went to pull the code nothing happened. I used a paper clip to jump A & B and had the ignition in acc. but the light just stay on.

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speed is a good thing,
more speed is a better thing
86' SLOW LG4 bone stock
except for a K&N
Future Mods: T56
350-383
miniram

 

btt

 

Your car won't go into diagnostic mode if you have the ignition in "acc".

You need to have the ignition in the "run" position with the engine OFF.

turn the key to the point right before the engine starts to crank, and you are in the right position. THEN jump A and B with the paper clip.



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86 Trans Am WS6 Black with tinted windows, shaved door handles
ZZ4, Mini-ram, true duals, LT4 HotCam, AFR 195 heads.
***Too many other mods to mention***

"In the future, cities will become deserts,
roads will become battlefields, and the hope of mankind
will appear as a stranger" The Road Warrior

 

the books all say KOEO, or Key On Engine Off

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ICON Motorsports

1st & 3rd
MM Black Diamond 538 F&AM

 

I turn the key the way forward, didn't start it though. I've pulled codes from it before but thiss time its wierd. I had to replace the O2 sensor so i disconnected the neg battery cable. as soon as I turned the key the code was back.
What is the deal? I've pulled and cleared codes before, but this time its acting funny. I even disconnected the ECM power cable and nothing changed. still came on.

------------------
speed is a good thing,
more speed is a better thing
86' SLOW LG4 bone stock
except for a K&N
Future Mods: T56
350-383
miniram

 

check to see if the ecm fuse is blown. i had an ses and the fuse was blown and it didn't put out codes. just and idea.

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350 vette engine
aluminum heads
235/60R15 BFgoodriches
3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt sony amp

 

Mikes idea sounds like the problem. The ECM fuse also runs to several ECM controlled devices under the hood, and a short in one of them, or the wiring would blow the ECM fuse. Weird thing, it was an '86 Iroc that I saw the problem on! The pink wire with black tracer got caught under the valve cover and over time it rubbed through the insulation and caused the problem!

Good luck!

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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand. (Man, those Fast-Burn heads sitting on it look good!)

Starting to look like the Kicker poster child!

ASE Certified Master Tech