NEED HELP!!! strange probelems after head install
#1
NEED HELP!!! strange probelems after head install
this is a question on 5g civic, but should be the same no matter what year...
my friend and i installed a vtec head on his turbo 5g civic dx. car ran fine before the new head. it was a pretty straight forward install. the BIG problem is that when he starts it up, the idle will bounce. then, if he hits the gas, it will actually rev down, and just about die...and start to backfire really bad. what could be the problem?
we checked and replaced a few things:
new timing belt/checked timing 3 times
replaced headgasket
replaced intake manifold gasket 2x's
changed injectors
changed fuel filter
changed distributor 2x
we changed NO WIRING.
my friend and i installed a vtec head on his turbo 5g civic dx. car ran fine before the new head. it was a pretty straight forward install. the BIG problem is that when he starts it up, the idle will bounce. then, if he hits the gas, it will actually rev down, and just about die...and start to backfire really bad. what could be the problem?
we checked and replaced a few things:
new timing belt/checked timing 3 times
replaced headgasket
replaced intake manifold gasket 2x's
changed injectors
changed fuel filter
changed distributor 2x
we changed NO WIRING.
#3
Re: NEED HELP!!! strange probelems after head install
4g are DPFI, 5g's are MPFI.
Check things like IACV and fast Idle solenoid. I have had problems like these and it simply was the idle screw needed to be backed out a bit.
Also Ensure that all the timing is correct. I don't know what all has to change with the head you used, but It's also been a timing problem before for me.
BTW: What head? Assuming it's SOHC is a y8 or z6?
Check things like IACV and fast Idle solenoid. I have had problems like these and it simply was the idle screw needed to be backed out a bit.
Also Ensure that all the timing is correct. I don't know what all has to change with the head you used, but It's also been a timing problem before for me.
BTW: What head? Assuming it's SOHC is a y8 or z6?
#4
Re: NEED HELP!!! strange probelems after head install
its a d16z6 vtec head on a d15b7 block. checked the timing 3 times just to be sure, changed the pcv out. we used the d16z6 intake manifold/throttlebody combo which worked perfectly fine before the swap.
#10
Re: NEED HELP!!! strange probelems after head install
hes running the stock ecu. hes not going to hook vtec up until he gets the car running right. everything worked properly until the head install. we went over the wiring harness a few times to check if anything was unplugged, but it can't hurt to check again...