Turbo_Mike

I put a 2000 ls motor / engine harness in my 92 vx a few weeks ago. obd2 teg harness plugs right into car, using a stock obd1 p75 ecu.


The car hesistates really bad like its missing... but it is throwing no codes. I switched the one o2 wire from unused plug on pass. firewall to the appropriate location. Sometimes once the car is warmed up it runs better, but its just **** poor when its cold. Idle is shaky and it often stalls at stop lights.

I've put a new cap, rotor, wires, plugs in. Checked all over for loose wires and poor grounds, including inside the distributor. Timing and belt are good. Ecu and injectors were swapped and known to be good.

If i forgot anything i'll post it up later, and this motor only has like 42k miles on it so its really clean.

Turbo_Mike

Sometimes it runs 'better' once it is warmed up, but it still starts to miss at idle and eventually stall.

Turbo_Mike

I tried to get some vids , but my digi cam got staticy

The first one i tried to show the hesistatino which can be heard really well in the exhaust (not so true in this vid though)


The second one was trying to show how it gets hung up from 2-4k rpm with light throttle then clears up after that.


Once its warmed up, it idles at 800rpm smoothly for a few seconds, then coughs and drops to like 200, back up to 500 running rough for a few seconds then cycles back to a normal idle.

Still no codes!

WhiteNess

Check ur MAP and TPS sensor plugs, they may be in the wrong sensor. That would make the most sense.

Turbo_Mike

Harness came on the motor, so all plugs are on good

Turbo_Mike

I was on the highway all day today, and sorta figure something out.

It was running good for the first half hour, then all of a sudden started stuttering again real bad. IF i shut the car off and turn it back on the hesistation goes away. Sometimes its good for 10 mins, sometimes only a minute. But if i turn it off and then back on, its 9/10 times better ( but only for a short wire)

Turbo_Mike

Threw a random code 43 (Fuel supply system) the other day too. Reset the ecu and it hasnt come back yet. Fuel pressure is good, filter is also fairly new. Fpr is good..... and the car ran fine like 3 weeks ago right before i pulled the stock motor.

Turbo_Mike

I guess it was the hx injectors i was using, put another set of ls injectors in and its all better