variable tickover

[xxxscimitarxxx]

had my 90 out for its three monthly run.....temps about 50 F

noticed on full or eco power mode that tickover was steady erratic and would be between 900 and 1300....

but not quickly variable as in going up and down between these figures while stationary.....it wasnt pulsing.....but just while standing.... something like, start it one time and all was well at 900.....then stop at some lights.....would be 1300......then stop at another set....900.....and so on on

linkages? vaccums? .....l dunno

Dave

[tccrab]

Originally Posted by xxxscimitarxxx

had my 90 out for its three monthly run.....temps about 50 F

noticed on full or eco power mode that tickover was steady erratic and would be between 900 and 1300....

but not quickly variable as in going up and down between these figures while stationary.....it wasnt pulsing.....but just while standing.... something like, start it one time and all was well at 900.....then stop at some lights.....would be 1300......then stop at another set....900.....and so on on

linkages? vaccums? .....l dunno

Dave

Dave:

Sounds like a typical vacuum leak.
Check all the easy hoses first.
My '90 leaked at the two hose PCV connector under the throttle body.
It caused my idle to cycle up and down about the same RPMS as you describe.

TomC
"Crabs"

[jonszr1]

while you are stopped and its at 1300, did you try blipping the throttle and see if it goes down ? did you clean the throttle body recently if so you may have wipped thr dag off the inside of the throttlebody.just a couple of thoughts i had .

[xxxscimitarxxx]

Hi again guys.....

no...havent cleaned TB.....blipping doesnt seem to do anything.....its either 900 or 1300 as it wants to be at the time of stopping.....

will look at vac hosing next time lm back

Dave.......