First thanks to all the people who post here it has been really helpfull.

I have a 91 z28 350 TPI and had a no start issue, fixed by reading here and my manual. I had a bad pick up coil and decided to swap the dizzy due to its age. Also put a new coil & ICM just for good measure. I got engine to operation temp and cut the it off. I unplugged the connector & started the engine, set timing @ 6* BTC cut off & plugged the connector back up then test drove. It ran smooth but had lost a bit of power woulnt even spin the tires. Reset timing to 6* BTC, now can at least spin tire but not like before. It also seems to be late shifting and has a lag at full throttle. You punch it from a dead stop and it takes a second before full power. If you are going like 35 or 40 and punch it then it also takes a little more time than usual to get spooled up. Thanks for any help i can get and when I find the solution I will post it so others can benifit as well. I a;lmost forgot when I unplugged the gray connector the book said it should generate a tbl code but all i had was the 12's the plug didnt seem to effect any thing as far as the engine running. i am quite sure i unplugged the correct one, it has a white single wire and a gray connector.

 

The only connector that I'm familiar with that you disconnect to set timing is a brown wire with a black stripe. It breaks out of the wiring harness just above the blower motor housing.

Maybe it's different on a '91?

 

I have the exact same problem with my car. I couldn't spin the tires from a dead stop for anything. I did the plugs, cap, rotor, checked timing etc..... and it restored a little bit of power to where i can spin them, but not as violently as i should be able to.

Do you happen to have a ticking sound from your car? I do, and its coming from my tranny. If you do, it could be something else not related to the ignition or engine.

I made the mistake looking and replacing engine parts to try to fix the problem.

Hope this helps, im just kinda rambling.

 

this is the only wire connector in the location that the haynes manual shows. I hope its the right one anyway

 

no ticking. before i replaced the ignition componants and the night before the pu coil died it would roast the rears and bark the crap out of second. Zoom Zoom>>>>>>

 

Well, humor me and just take a look. If it's there we both learned something. If it's not then I learned to keep my yap shut!

 

sorry it took so long we have a 6 month old german shepherd and he had to do some doggie bizness. the connector that i unplugged has a white wire and goes to the coil connector closest to the firewall. there is a white wire with a stripe that is almost above the strut tower. do ya think i unplugged the wrong one??

 

I have a German Shepherd too. Great dogs!

Don't worry about how long it takes to respond. Heck, I didn't expect a response at all!

Some things change from year to year but, I didn't think the EST bypass wire changed. I certainly could be wrong but, I think the wire you need to disconnect is over the blower motor housing. It should be a brown (or tan-ish) wire with a black stripe. Black connector.

The timing instructions should be on a label on the underside of the hood. If every thing's stock that is.

Do a search on EST and you may find a recent thread where someone asked the timing question.

Good luck!

 

do you have a code 42 by any chance?

 

i went back out there and found a light tan wire with a black tracer in a black bullet type connector i will warm it up tomorrow and giver a try. thanx for all your help. i think i did unplug the wrong wire. i was supposed to be rebuilding the steering linkage this weekend but this popped up.GM= generaly manic

 

no tbl codes at all

 

found correct wire and set time and vroooom!!!!

 

Great! Thanks for the update!