Hey guys, I have a 87 TII that does not want to idle when cold, no big deal, but when it warms up, I can not rev it over 3k rpm and when I drive it falls on its face if I try to speed up, but it will rev normal when cold... Any suggestions?

 

check the TPS

 

I set the TPS after warming the car up to 1ohm already, and i took the crank synchronizer out and re timed the engine back to factory and still the same thing, if the car is cold it is fine, if it is warm it won't rev very high and no boost, I did just re set the thermowax idle screw so it actually will idle when cold now.

 

Collapsed pre-cat.

 

yep, could be a failed cat or precat.

 

Just put a full racing beat exhaust on the car and still same issue, but I removed the upper intake and noticed it has a lot of vacuum lines that are rotted off and some just not hooked up

 

then fix the vacuum lines, check the voltage at the TPS versus simple ohms, check fuel pressure, grounds and replace the fuel filter if it is old.

 

I took it all apart because I was doing the emmissions delete, I do have a JDM motor so originally had no EGR but I took out the rats nest, re did all the vacuum lines and coolant and new fuel lines, put it back together and it runs perfect when it is cold, I can free rev it all I want and hit boost, bu the second it warms up and goes into closed loop it doesn't even want to run and drove it around the corner and it won't rev over 2k RPM while driving.

Mods: JDM engine swap, emission delete, whole turbo back exhaust.

My only question is- will a bad air flow meter cause this issue, or possible a bad TPS, I will OHM out the operation of them tomorrow but out of ideas at this point in time.

 

do a sweep of the TPS, i suspect it has a dead spot in the signal(faulty TPS).

 

And check the Water Thermosensor.

 

So today I took off the TB and did the TB Mod (delete thermowax, took out the secondary section ect..) And now at warm up I can rev it but it stumbles a little but won't go over 4k, I assume that means it has a issue with the secondaries.

Secondary injector part # 091800 ( found out they are 800cc injectors, low impedance but sais for 86-88 NA)

Primary injectors are red and I believe those are NA 450cc injectors

Please correct me if I am wrong , I will sweep the TPS tomorrow as well