I put a jspec motor in my '90 gxl. Idle moves around a bit(between 1500-500) but everything's running fine until I reach 5000 rpm . When the car reaches 5k rpm it hesitates and it won't go past 5500 rpm. It sucks beacause I know I'm missing out on the good stuff. Any suggestions?

 

will it pass 5500 under no load

 

what do you mean by hesitation...

 

I tried holding the revs for a couple of seconds and it wounn't go over.
--By hesitations I mean that when the car reaches 5k rpm it feels like a governor. The car won't accelerate any further and the rpms won't keep climbing.

 

check your compression. Alot of motors come from japan with carbon lock (mild)


my friends motor wouldnt rev up and after he drove it for awhile it loosened up (some atf too)

 

Carbon lock? How do I know it that's the cause? It doesn't smoke at all....
.
-By the way, I have an FD fuel pump and injectors are clean

 

bump