Hello everyone, I just ran into a problem I was ready to take my 91dx with the b16a for its first spin after getting the engine in and ready. It was normal before but ran a high idle, now the idle is fine running at 800rpm. The car runs ok and sounds perfectly normal until I rev it up and it gets to the 3000rpm mark and then starts to want to backfire then if i hold the throttle down a tad more it will backfire.....what could possibly be wrong? I was thinking something with the distributor maybe i need to replace it, but my one freind said that it could be a stuck valve, but why would it run normal before it hits 3000 thats why i thought it was something with the timing but i beleive its set right. Somehow air is being pushed back into the intake manifold. Anyway id appreciate any help. I was looking forward to taking it to this honda gathering and show this saterday but i think ill have to replan especially if its a valve....I hope not
thanks alot

 

Sounds like your timing is off. check it again maybe. If it was the valves you'd hear it at idle.

 

Does it rev any higher than 3k? If it doesn't you could be in limp mode. Any CEL's? Check the wiring to the distributer plug also. I have a similar problem but its intermittent.

 

check code or it usely tp sensor or throtle body

 

Does it rev any higher than 3k? If it doesn't you could be in limp mode. Any CEL's? Check the wiring to the distributer plug also. I have a similar problem but its intermittent.

Are CEL's the beeping light codes on the ecu? I dont think i have any of them, the tps was on but i adjusted it and then it ran properly. Also whats limp mode and how doyou get it out of limp mode? Distributer plugs are wired correctly I ran the tach directly off of it....but would you think that the distrubutor rotor and coil could be the culprat?

 

I think its your timing also. It has to be DEAD on. Double check it

 

Yeah I think your right, I just drove it like 500ft down the road and turned it back right in the driveway. The valves have to be opened for that air to get back into the intake. No power, I reset the ecu and plugged back in the battery, it was fine, then it started up again, but this time i received a code 4 which is the crank position sensor. Im almost positive its the timing. I will definately recheck it and let ya know whats goin on. Thanks alot everyone for your help so far.

 

would anyone by any chance have a diagram that i could see of how the timing is supposed to be?

 

The timing is supposed to be dead center. Align the first piston to TDC either using the marks on the crank pulley or feeling it through the spark plug hole and line the cam gear with the aroow up and the notches flush with the head. If your crank positions sensor isnt plugged in you need to have your vomputer chipped so as to not look for it.