Help me out.

[Chase]

This is my first DSM, and at this point Im kind of lost as to what to check next. Car idles like it has cams in the damn thing and the motor is all stock. I tried flipping the CAS and that seemed to not help at all so I put it back. It also is misfiring under rev now and the plugs are new and the coil and wires are fine. Just looking for some input on what to check next. Im attaching a video of it at idle. Keep in mind it has no exhaust right now so it sounds like hell. Thanks in advance.

click

 

[onesickcrx]

what have you changed since the last time it ran ok?

 

[Chase]

Its been acting up since I got it. I got the car with a motor that had a spun bearing so I put a whole new running motor in the car. It doesnt have a ton done to it either. evoIII 16g on a crap tubular mani, fmic, 2g maf, the head is ported if i remember right but that shouldnt do that, 10mm wires and thats really it motor wise at the moment.

 

[desant78]

this is a really dumb suggestion...but I have feel victim to this.

make sure the spark plugs wire are in the same place...and I DID THIS TOO. I just did not realize the previous owner, attached the coil pack in such a way it was not clear which should be the front or back. for the hell of it, i put the plugs in complete opposite order, basically backwards.

and this fixed this exact issue! so hard to start...misfiring like yours, and was very very unresponsive. good luck!

 

[vtecds1]

Did you change the belt or check for timing?

 

[Chase]

I checked the timing on the motor before it went in. It was correct.

 

Try to find someone that has a known good injector resistor pack and power transistor/igniter.

Try a boost leak test too. And like someone else said, double check that your spark plug wires are on the correct coil pack ports.

How is your ecu? OPen it up and inspect the board for cap leak.

And check wiring to cas and make sure there are no broken wires. In fact check for broken wires on every electrical part as the wiring on these cars is very old and brittle by now.

 

[onesickcrx]

Quoting Chase:
I checked the timing on the motor before it went in. It was correct.




How about with a timming light?

 

[turbowop]

Make sure the exhaust cam isn't retarded one tooth.

 

[NYC86ZC]

You have a 2g maf, but do you have a chip or 550's?

Quoting Chase:
Its been acting up since I got it. I got the car with a motor that had a spun bearing so I put a whole new running motor in the car. It doesnt have a ton done to it either. evoIII 16g on a crap tubular mani, fmic, 2g maf, the head is ported if i remember right but that shouldnt do that, 10mm wires and thats really it motor wise at the moment.

 

[Chase]

ECU is not leaking, isnt an eprom either. No chip but I do have Evo 560's in it.

 

[vtecds1]

I could be wrong...but don't you need some sort of fuel controller?

 

[turbowop]

560's and a 2gMaf almost cancel each other out. It will run and idle fine, but I wouldn't start stomping the throttle all over without some sort of tuning device. That is what I run in 503 and with the SAFC zeroed out it starts and runs just fine. I had to make minor adjustments for idle and cruising and some bigger adjustments to airflow/fuel at WOT.

 

[Chase]

Yea I have the AFC and its zeroed and it still acts up. I disconnected the maf signal though because it wouldnt start at all with it which is why I didnt mention it.

 

[turbowop]

Disconnected the maf signal? Did you resplice the maf signal wire back together so that the ECU would see the signal?

 

[Chase]

yes

 

[AnotherNewb]

Quoting onesickcrx:
Quoting Chase:
I checked the timing on the motor before it went in. It was correct.




How about with a timming light?



Since you pulled the CAS it NEEDS to be adjusted with a timing light now. The simple checks would be a boost/vacuum leak test. Re-check the gap on your spark plugs and get a data logger. Once you do that, do a cylinder drop test by pulling plug wires one by one until you find the one that doesn't change the idle or doesn't kill the motor. Also a compression test or leak down test may be needed.

Did you know anything about this motor before you put it in?