So.. i just swapped in a d16 i bought off of a member here. bolted all of my existing parts on there and trew it in. new oil plugs whatever completely redone. so i sit in the car. turn the key twice let my fuel prime then start. i get loud *** backfires and the car struggles to start.

so i let it chill for a bit n noticed the cat was RED so i thought restricted exhaust. checked and it was fine, checked the cat and that was fine everything from the exhaust end of the engine down is ok. checked my gas lines gas filters vacs and all. everything looks damn fine -_- so frustrating.

hoping if anyone ever seen ne thing like this and can point me in the right direction.

as of what i know from the seller - the motor is mint. rebuilt 10k ago. i checked before i did anything and everything looks dandy. what could be causing this? i even unbolted everything from the cat down and started it with headers only and still backfires. im thinking timing but that looks good to. changed the distro with another crx's and same problem even ecu. im stump fellas. ne help is greatly appreciated.


I checked:
fuel lines and fuel systems all the way to each injectors.
vac lines
cables and ground
exhaust and back
head and valves
distro

i mite have left something out...


thanks in advance.

 

^

 

backfiring is caused by timing generally.... but your timing would have to be VERY off for it to be doing that.. you should put your crank pulley at TDC and see where your cam pulley lines up. if everything is lined up, jump the timing plug and use a timing gun to verify that your timing is somewhere close to where it should be. i suspect that with the glowing header that your timing is all the way advanced.. which is bad.

Is your ecu stock? or has it been reprogrammed? and which ecu are you using?

 

Im shooting for timing problems, i dont think it has to be that far off in order to cause problems.

 

its a pm6 ecu. as to my knowledge it hasnt been chipped/reprog i even took another pm6 off of a friend's crx. same problems. with his car i switched distro and everything else. i think its timing. hmm i'd need to find someone with a timing gun or that can check.. ne one near by? lol.

I'll forsure check this out asap. ne other ideas? i suspect it was running rich... -_- makes me wonder what the motor had gone trough.


btw at times it would start and run kinda fine except starting out at like 1200 rpm but decreases then i hear backfires every here and there. thats prolly when the cat started to heat up.

 

it sounds like you have the plug wires in the wrong order in the dist cap..check that it can be an easy mistake that can be over looked ..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jayturboef &raquo;</TD></TR><TR><TD CLASS="quote">it sounds like you have the plug wires in the wrong order in the dist cap..check that it can be an easy mistake that can be over looked ..</TD></TR></TABLE>good call, check that also..

 

i have an EF civic 91 Si with a D16A engine. Im planning to put some DC headers on it,i have the stock exhaust system will that be a problem?

 

that shouldnt have any problems. im running stock exhaust also. just found that the timing had skip a tooth and that one of my injector was stuck on open. im sure its shot. im changing it out today and doin another check up. double checked my distro wires and i had the 3 and 4 wire crossed. seems like its many small issue creater loud gun fires from my exhaust. lol

is this correct guys?
looking at motor from front of car:

4321

Distro from passenger side.

34
12

I'll update the thread. thanks alot for the pointers guys.

great community.

mike

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mysicivic1991 &raquo;</TD></TR><TR><TD CLASS="quote">i have an EF civic 91 Si with a D16A engine. Im planning to put some DC headers on it,i have the stock exhaust system will that be a problem?</TD></TR></TABLE> Using your first post to jack someones thread is not a very neighborly thing to do.

 

&gt;.&lt; agreed. thanks dr_latino999

 

No problem, I see that you found more than one thing wrong at once. Those are the worst to troubleshoot IMO; if you change them both and now it works you'll never know the exact problem. Not that it matters if it works from that point

 

lol truly. gah i think when my cat turn red it burned it... i can shake it and hear small clicks like small bolts shaking around inside. but the element is still in there. ne one have a spare crx cat? ill make sure to keep this posted.others might encounter the same problem and this mite help.

btw: dr_lationa999 the d16 on crack is the shitz! lol

 

your distributor wiring order is correct as you posted it. with all those problems found and fixed, ill be surprised if you have not fixed it.

 

ok so everything is good now except when it starts my rpm flies straight to 3k and slowly eases up as if i was slowly stepping on the trottle. i checked all my vac lines and no leak. i dont think it would be a leak since it slowly increases. can it be a tps? or a sensor? i checked trottle cable as well and it has no tension on it.

 

Bump^ im going to purge the coolant make sure theres no air in there. if this doesnt work then i might just have to pull off the intake mani and switch sensors with another one i have. any other ideas?

the car starts on a dime but rpm level is high like 3k+ and climbs.. ill prolly double check and switch vac lines also just in case.

 

i apologize, i didnt mean to jack your thread i just had a question relating to d16 engines and now i know not to do that. sorry about that, and thanks for answering my question.
peace..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jayturboef &raquo;</TD></TR><TR><TD CLASS="quote">it sounds like you have the plug wires in the wrong order in the dist cap..check that it can be an easy mistake that can be over looked ..</TD></TR></TABLE>

 

no big bro. everything works now. but on the day after i started the car i noticed right under my alternator is a leak and its leaking coolant. i think one of my water pump seals broke or got messed up. gotta check the whole thermostat for rings n seals.