5th gen engine problems - Toyota Nation Forum : Toyota Car and Truck Forums

Jamesdem1123 · 07-11-2004, 08:45 PM

yea i have a 91 st with auto (4a fe piece wanting to convert to 3s gte, lol) and for sum reason when i barely tap on the throttle the rpms will fluctuate and occasionally stall, i replaced the pcv valve and that stopped it. For a week, and now its back. Anyone no how to fix this? thanx

Kidane · 07-13-2004, 08:46 AM

Vacuum leak? How many miles on your engine? I have a 4AFE too.

Jamesdem1123 · 07-14-2004, 09:42 PM

Quote:

Originally posted by Kidane
Vacuum leak? How many miles on your engine? I have a 4AFE too.

i dont think its a vacuum leak but ill check, it has about 68k on it

Deep · 07-15-2004, 09:01 AM

Dirty IAC valve?

lloydjv · 07-15-2004, 01:15 PM

A dirty IAC can cause all kinds of problems with idle. I have seen a thread somewhere regarding the cleaning of the IAC, but I can't remember where.
I am not sure about the 4afe, but the 5sfe has coolant lines running to it, so if you remove it for cleaning, perhaps drain the coolant a little, and plug those hoses until you are done.