ok i got a 91 crx si and its got the zc in it and is runing a 92-95 intake manifold. the car was runing fine and now when it gets to operating temp the car starts to run like crap it will miss and the tach jumps a bit. no check engine light or codes. ive aready got a new dist. i changed the fuse box, relays under dash, tryed another ecu. this thing has me stuck. its my brothers car and i cant find the issue. it seems to have good fuel pressure. ive checked over everything i can think of. its just weird how it only happens when it gets to normal temp. any help will help. thanks

 

bump

 

Did you remove all of the obd1 sensors off the intake manifold? You need to install the obd0 sensors onto the intake manifold....unless your car is converted to obd1.

Did you accidentally switch the IAT and IACV plugs? They fit each other perfectly. Are you using an obd1 fuel rail with the obd1 manifold?

 

yeah it has obd1 manifold and fuel rail. and i relocated the map from the firewall to the type on the manifold. but the IAT is obd1 also is the tps etc. NOTE: its got obd0 injectors

 

the plugs are in the right place. it only does it when the car is warm. idles perfect. it was running fine for 3days now this problem.

 

so when it idles at operating temp, its rough?

or at high RPM, at operating temp, its rough?

 

it idles fine and runs fine but when it gets to operating temp it starts to stumble inconsistantly. and tach jumps a bit. and it dies sometimes.

 

it does it at idle and high rmp when at opp temp. but more in higher rmp

 

bump...

 

I'm having some of the same problems too, does it just stumble or does it lurch sometimes also?

 

It sounds fuel related, i dont know of anything else that could cause stumbling.

 

I was thinking the same thing but whats got me is that it only does it after the car is at oppreating temp. mabe the fuel pump or injectors? but if it was those uasuly it will start messing up right away not 10min later

 

Has any one elce exp this problem too?

 

Bad fuel pumps tend to fade as the warm up.
I had a mini van that would run great for about 10 minutes, then quit. 20 minutes later it would run long enough to get me home again. New fuel pump fixed the issue.

 

well let me try that and see how it works out.

 

Perhaps some of the sensors are wired in wrong? (i'm a noob, but something close has been hapening on my car) Try unplugging a few of the sensors 1 at a time and see if it flashes the right code.
I know i the o2 sensor wire hooked into the coolant sensor on accident and it would start up rough and once it warmed up would run a bit better.
Just my $0.00002

 

thanks but i know for sure everything is hooked up right. the car was running strong and no problems at all. iam going to pick a part to pull out a fuel pump im sure its that. iam going to let the car warm up and when it acts up iam going to test the current on the pump wires.

 

Did you do anything to the car before it started running weird?

 

the only thing that was changed was the plug wires. my brother got some big *** ones off ebay and i told him not to use them but he did. and the dist coil got burnt out so i rebuilt the dist and i changed the o-rings under the rocker cuz it was leaking a bit. and thats all i can think of. it has a rebuilt zc new fuel filter etc. i thought the rocker o-rings were ok to reuse but wrong. so thats all that was done.

 

oh and he used my mines dohc zc ecu too but only for a day.

 

Get the correct ECU, if you havent already. Replace the dizzy with a known obd0 D series.

 

its got the stock pm6 ecu in it. and its all obd0 never altered the wireing

 

ive changed fuse box under hood, main relay, fuel pump, fuel filter, cap&rotor, plug wires, dist coil. this car is pissing me off am about to tell him to sell it.

 

bump for help. i was thinking ignitor.iam going to try that today

 

bump it