Bricksters,
Here is my exact symptoms, cold start is OK, idle jumps to around 1600 and drops quickly back to about 750RPM (normal operation of IAC right), runs very smooth but shudders trying to get off idle in response to throttle and will ocasionally stall when I put into gear (Auto). As the engine warms up idle speed slowly increases to about 1000RPM and the engine begins surgeing rythmically 2 seconds fine 1 second shuddering with loss of RPM. Drives OK, seems a little down on power.
This is what I have done. Cleaned throttle body, adjusted throttle stop, adjusted throttle position switch, checked for vac leaks, replaced injector seals, dist cap, rotor, leads and plugs, cleaned IAC, cleaned PCV, checked O2 sensor, FPR. BTW Cat is rattling and will be replaced soon. Wiring harness is suspect.
Before I start randomly replacing harness, AMM, O2 sens, FPR, IAC etc I once again throw myself at the mercy of the collective wisdom. I thought it may have been the FI temp sensor, when I unclip it RPM's rise and the surge almost disappears. I have the details on how to check it at the ECU from the FAQ but how do I do this? it says: with the control unit connected check pin x to pin x? I can not get to the pins with the connector on? Do I have to take it appart? how does the pin numbering work?
Thanks All
Karl
86 245 B230F