92 z34 3.4l

[Gunboat]

I recently was driving my 1992 chevy lumina z34 with3.4l DOHC,I was doing 70 on the expressway when it went dead.I replaced the Crankshaft sensor,the car was running great before the sensor went out,now it refuses to start,just hitting occasionally,I also replaced all of the spark plugs.Does anyone have an idea as to what is going on? It is getting plenty of gas,just no spark,just on occasion,real bad backfiring also.
thanks in advance.

[Schurkey]

What is the cranking compression?

Are the plugs fouled? Plug wires connected to the correct cylinders?

Will the spark jump the gap of an HEI spark tester? (the one on the left, about $12. There are other styles of spark testers, I haven't tried them.)

[RedZMonte]

how many miles is on the T-belt? sounds like it may be out of time.. if you pull a plug and leave it in the wire and set the plug on metal (i use the radiator support) does it spark? any check engine light codes? if yoiu dont have spark on all cyl's then i would suggest looking at the ignition control modual... they have gone bad occationally so its not unheard of. so you replaced the Crank sensor already and still no start? the crank sensor IIRC will not allow spark if it is bad or not working correctly. Hope this helps

S

[project 92z]

I would have to agree with Shane. Kinda sounds like the Timing belt when Kaploo-ee. Have someone give you a hand and try to crank it over with the cover off. The teeth might have sheared off on the lower gear. My last Z34 did the same thing, except I was only doing about 40 (gunned it trying to make a light).

[pocket-rocket]

The teeth might have sheared off on the lower gear. My last Z34 did the same thing

I've had the same exact thing happen on my 91 years ago, so this isn't really unheard of.

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[Gunboat]

Ok,guys,thank you all for the replies! what originally happened was I was driving at 70 on the xway,the car died,found out it was the crankshaft sensor,to make a long story short,found out that the plugs had fouled,it blew the Ignition control module and it had blown a coil pack completely in half!Not to mention that the crankshaft senor was cracked too. This was an "Adventure" to be sure. "AND" not to say that my mechanic friend and I almost got into and real heated arguement over who was right when it came to the control module and the coil packs!!! But thanks for all the input!! I have used the site before,and it has been really informative and helpful!..so,in closing,I hope that what I have posted,will help someone in the future...I want to go back to the old muscle cars,at least "I" know what to fix on them!
Many thanks again!!!!

[pocket-rocket]

Wow, that's nuts! Got pics of the pack? That would be neat to see.

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[xLeGeNDx]

I have to agree as well, that would be really neat to see

Swyped from my HTC One X using Tapatalk 2

[Gunboat]

Nope,I threw it out before I thought about taking pic,sorry...but it was cracked right down the middle with melted plastic comming out of it..
BTW,here are some pix of the car