91 laser wont run

seether221 · Jul 4, 2014

Okay so i got a 91 laser that had a snapped belt, got it for a steal so i couldn't refuse. Bought a new head got it resurfaced, ordered completely new gasket set, rod bearings main bearings and piston rings, bought new head studs also. Put it all back together didnt run, tore it back apart to find number one piston hit the head 0.o I'm not sure what happened so i got another head had the machine shop completely go through it, ordered another new timing belt got arp head studs head gasket set and new pistons. Put it back together still have fuel spark and timing is dead on, I'm completely lost when trying to start it backfires through intake

93tsi6bolt · Jul 14, 2014

Get a comp tester from autozone they rent them.

mitsubishikid · Jul 14, 2014

Did you inspect the ignition power transistor, and it's wire connector?

Also did you check the mas, and it's wire connector.

check the injector wire connectors and test the injectors with an ohm meter...in fact it might not be a bad idea to go over, and inspect all the engine compartment wire connectors for corrosion, or snapped wires etc.

seether221 · Jul 16, 2014

I thought i had answered this question yes lifters have been bled I'm aware of the issues they cause when not bled, the car is also no longer backfiring through intake.

seether221 · Jul 16, 2014

Will have to try ohm meter, all plug ins logo good with no corrosion. I rented auto ones comp tester, its defective.

mitsubishikid · Jul 17, 2014

Wait...are you using a 1990 e.c.u in a 1991 dsm?
and if you are, did you swap the pins on the e.c.u connector?

the 89-90 e.c.u's is not interchangeable with the
91-94 ones, unless you swap pins 6 and 14 they need to be reversed.

seether221 · Jul 20, 2014

Okay guys, i got a compression tester and got 0 10 10 0 and zero. I've searched tuners to make sure i was doing test right and assumed i had bent the valves, well i have the head off and all the valves look to be seated properly with no issues. Please excuse my ignorance throughout this thread i am just truly lost

seether221 · Jul 20, 2014

I just performed fluid test to be sure that valves were seating correctly and all come out good with no leaks.

seether221 · Jul 21, 2014

Well i got a new head gasket, bled the lifters, put it back together, got it in time and guess what, it still doesn't start

93tsi6bolt · Jul 26, 2014

seether221 said:
Well i got a new head gasket, bled the lifters, put it back together, got it in time and guess what, it still doesn't start

That sounds a lot like your out of time and your valves are opening under compression strokes.

seether221 · Aug 5, 2014

Valve heights were off, thanks for the help.

livedsm4g63 · Aug 5, 2014

No seats for the springs? What springs were you running? How could you not see that all of the valves were open at once?

seether221 · Aug 5, 2014

Not all valves were open, piston 3 and 4 had one on intake that were slightly open piston 1 and 2 had one on exhaust slightly open, when i did fluid test cams were not installed. When i installed them is when they would crack open just enough that it wasn't visually noticeable, all the valves with heights off were valves that were replaced by previous owner of the head. Had machinist fix them installed head and car started right up. It runs rough though so something still is not right. Springs are factory i suppose

livedsm4g63 · Aug 5, 2014

Ah, ok i see.

Have you verified base timing, biss, etc. Never hurts to do a once over.

seether221 · Aug 5, 2014

I plan to this weekend, now that I've finally gotten the car to respond i can solve all the problems. I got the car in non running condition so I'm going to double check everything. First time I've ever heard the car start up was the day i had to leave for college.

livedsm4g63 · Aug 5, 2014

Nice, if you need help shoot me PM.

seether221 · Aug 9, 2014

Alright here a video of how it runs, anyone got any ideas?

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