no power, no SES light, need some help

[batou]

Hi, I have a 92 z34 3.4 with auto.

couple days ago I was leaving home for work and while going up the street, it lost power like somebody flipped a switch. to the point i have to floor it and down shift whenever i want to accelerate.
The car seems to be running ok until you drive it, meaning it idles fine, maybe a couple hundred rpm lower than usual but it sounds ok.
whenever I test drive it smokes a bit from the undercarriage, seeming to come from the exhaust, thats why i checked the cat.

I have replaced the egr valve, tps, iac, and checked the cat (ran open headers up and down the street.. neighbors gave funny looks).
It has never displayed a ses light, when I pulled the codes all i got was a code 35 (iac) which I then changed out and it did not make a difference.

I have found one broken vacuum line that goes over the brake booster and along the firewall as a rubber line then transfers to a plastic line... which has melted through from the heat from the exhaust, so i have no idea where it goes to, i think it had a 90degree connector at the end of it, I saw it hanging loose when i changed out my high pressure line, couldn't find where it went then either.

At this point I am lost as what to look at next, what really boggles me is that there is no ses light and it idles fine, if not a little low, it doesn't seem to have a miss and it doesn't smoke at all, oil looks good too.

Thanks for the help.

[bszopi]

I'd look into your coil packs and then possibly your ICM. But running good at low RPMs but crappy out up high sounds like coils to me.

[batou]

well I looked into it a bit further. Seems I did not have spark on cyl 2 and 5, so I replaced that coil... but I still have no spark. Any ideas? is there a fuse that I cannot find that controls just that coil?
Thanks

[batou]

anybody?

[sil]

most likely Ignition Control modual

swap them around and see if the dead cyl follow the coil, or if its allways that 1 spot on the ICM
just keep track of how your firing order is :P

[batou]

Is there a way to test the ICM? I dont want to spend another 100$ without being sure.
Thanks again

[Eric's93z]

Iam Thinking Its Your Fuel Pump......my 93 Z Did The Same Thing.....was Driving Fine Then The Next It Lost Tons Of Power, Actually Had None.

[pontiacdohc@gmail.com]

yes, just about any auto parts store can test ICM and i know they can test that one because they tested mine.. I was running into the same problems i thought it was the icm also but it tested good, it ended up being a bare wire that pluged into the ICM, if it is bad get one from a junk yard and it the store and get it tested too before u put it on