slow4dr

I have been on here for many years and mostly read but I need help. I have searched.

I have a 97 civic ex 4door

I just swapped a 98 GSR motor into it. I used my stock ex harness and running a chipped p28 ecu. I cant get it to start. Initially it sounded like it wanted to start but had no compression. The timing was off big time..that got taken care of. Now it cranks and turns good but wont start and after my 3rd or 4th attempt the intake manifold backfires pretty bad...I can't figure it out...the wires are in the right order...could this mean bent valves? any help is appreciated

SOHC_4dr

i would have to say check your timing again. if you want to see if your valves are off do a compression test and see what you get. you'll have low numbers if your valves is bent

slow4dr

ok Im testing tomorrow for compression....thanks!

gsrhatch2356

a pop or backfire usally can only happen two ways either valve timing or ignition timing. If the valve timing is off and the intake valve is open when the ignition wire goes to fire then "POP" then of course if the ignition timing was off (mixed plugs wires, screwed up tdc sensor, bad distrubter) either way the injector fires at the right time and the intake valve opens and the ignition can fire right as it is sprayed or the fuel could sit on top of the piston untill it comes back around. either way check your valve timing and then try and get a timing light to verify your ignition timing. Of course like already said you really need to do another compression check cause if the timing was that far out before then a bent valve could be a likley cause of your problem. good luck man.