Volvo RWD 700 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 3/2004 700 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Idle problems AMM problems? 700 1991

posted by  someone claiming to be ibs740 on  Wed Feb 25 03:31 CST 2009 [RELATED]


Hi,

My 91 740 turbo wagon has been acting weird for a bit. I had a bad ECU (High HC @ idle) during an emmissions test. Swapped the ECU for a spare & the oxygen sensor & it passed. The oxygen sensor wasn't sweeping btwn 0.1-0.9 VDC. Just kind of hovered around 0.5 VDC. I actually think the sensor I swapped is OK.
I have my Programa ECU back in now & problems continue. Persistant Lambda trim errors. I've had both errors lean & rich.
Problems are high idle (1400rpm), popping exhaust @ idle, poor gas mileage.
Starts & runs OK. Does a tiny diesel when the ignition is turned off (rich).
Did the FAQ AMM test & tests OK. Runs real bad if disconnected.
I have finally found my intermitant vacuum leak. # 3 intake runner. It finally leaked long enough to find. Water spray worked great to find leak. Will fix this weekend.

My question is can a bad AMM cause damage to the hybrid circuit or other parts of the ECU?





THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New Idle problems AMM problems? [700][1991]
posted by  someone claiming to be ibs740  on Wed Feb 25 03:31 CST 2009 >


<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.