Ok the car turns on now with no issues! But when you accelerate it it's popping, we checked timing and it's on point, we checked the spark plug wires , coils are working. Whatelse can it be

 

Usually that would indicate a lean mixture.

Some info on the car?

 

It's a 87 with a 91 motor ( JDM) also just changed new injectors and new coils. Spark plug wires . Just got the motor running not too long ago..

 

It feels like a electrical issue. Not sure where to look at now

 

TPS and vacuum leaks.

 

Tps. Vaccum leaks?

Well it has an open down pipe but I've ha other turbo2's with open down pipes and no issues.

And when you do put it in gear it struggles really bad. I won't move good at all. Turns on fine, just doesn't move well at all. But I will post a vid in a few seconds .

 

Does it struggle at all rpm's? Are you using the ECU which came w/the engine? Have you pulled for error codes?

 

no im using the ecu that came with the car. The car is an 87 turboII. motor is a 91, but I changed the oil metering pump from electronical to mechanical.

it seems to struggle just when its on gear but it pops even when its in neutral.

 

So you are using S4 engine sensors? Is the throttle body S4 or S5?

 

i believe its an S5

 

What about the engine sensors? S4 or S5? If the throttle body is an S5 then are you using an S5 TPS? The S5 TPS has two pistons extending from the sensor while the S4 has but one.

 

i think they are s5 as well. I am really not sure to be honest.

but i believe the tps is s5..

so do u think it can be the TPS?

 

An S5 engine must be coupled w/the S5 ECU unless the engine sensors were converted over to S4. The S4 ECU will not properly run an S5 engine w/S5 sensors.

 

really? ive had a similar swap before everything with s5 and just changed the oil metering pump and never gave me any trouble at all what so ever.

 

here is the vid. not sure if you can hear it popping.

 

Does "everything" include an S5 ECU? The S5 sensors provide different inputs than S4 sensors so the ECU needs to match the sensors used to make sense of the incoming information. The S5 sensors have a different number of wires than the S4 counterparts so they would not mate properly w/the S4 ECU. An S5 AFM has a different amount of wires compared to an S4, the Boost sensors are different in the wiring configuration and so on. I'll defer to others to give their opinion on the situation.

 

oh ok did you see the video?

 

try advancing the CAS timing 1 tooth and retry, advance the timing one tooth until the engine sounds more normal and see where the timing is at then.

 

ok. I will try that tomorrow. Thanks boss.

 

I'm about to check timing

 

I'm with Satch. It doesn't sound like you have the right ECU/Sensor match-up. It does make a difference. I fail to see how an S4 ECU can run an S5 AFM, TPS, BAC, etc... Especially without making modifications that I'm sure you would have explained by now.

Unless I've missed something, you'll need to track down an S5 ECU and harness. And be sure it's a Turbo ECU of that's the case as well.