DougC
Oct 31 2005, 09:48 AM
(2.7L w/CIS) Ok, I replaced my fuel pump this weekend and the engine fired right up just fine. I had to adjust the throttle linkage to get it to idle at an exceptable rpm and not die. When I took it out for a run around the neighborhood it would want to die at the stops. Could this be a vacuum leak? I think my vent hose from the engine case to the oil tank may be slightly too short. Could timing cause this also? While I was initially trying to get it to idle it would sometimes start a pulsating rythem until it would die. suggestions?
PS - oh, BTW it ran really strong during my blast around the neighborhood
Doug C
ClayPerrine
Oct 31 2005, 09:51 AM
Did you hook up the Aux air regulator?
Also, adjusting the throttle linkage is NOT the way to get the idle up. There is an idle speed screw on the throttle body.
Do you want me to come over again?
Jeroen
Oct 31 2005, 09:51 AM
don't change a thing... this is a great opportunity to learn to heel-and-toe
lapuwali
Oct 31 2005, 10:12 AM
The pulsating rhythm is lean surge, and is caused by too lean an idle mixture. There's an adjustment for this on the top of the airflow meter, or you may have another air leak after the airflow plate.
Clay's right in that you don't futz with the linkage to get it to idle. Use the idle air bypass screw for this. If you plumb in the aux air regulator AND IT WORKS, then you should have a higher idle while the engine is cold. If you just cap this stuff off, then you'll need to hold the throttle open with your foot until it warms up, which may take several minutes. Adjust your idle with the engine HOT, as in take it out on the highway for 15-20 min at least.
Timing that's not advanced enough can cause a slow idle, yes. Once you can get the engine to run long enough to get it fully warmed up, set the idle (with the bypass screw), then set the timing, then set the idle again (it will change if the timing was off).
DougC
Oct 31 2005, 11:27 AM
Mike, thanks for reminding me of the altitude difference - that's definately something to consider. Actually Clay had to richen it up one notch to get it to start in the first place, it may still need a little more though. This engine sounds much better than I had expected it to especially under excelleration. OK, back to twisting Clay's arm..
Doug C
charvey
Oct 31 2005, 02:36 PM
check the alternator belt, mine broke at one point and i had the same problem
ClayPerrine
Oct 31 2005, 03:04 PM
That means that I gotta richen the mixture. Time to dig out the CO meter.