sidewaysste
Active Member
I'm wondering if anyone has come across this specific idle problem before....
When warm when letting off the throttle completely (such as when going downhill) on my 3.9 auto at over 30/40 mph the engine revs drop to <500 rpm and the engine cuts out. It doesn't do it from cold and there is no hesitation, misfiring or any other symptoms to suggest an ignition fault. The base idle is set to ~950 rpm and the ignition timing is not a million miles out.
Now I have rebuilt the distributor recently to seal it when wading and as a last resort I'll strip it and check the air gap on the reluctor but I really don't think that's the problem as I have no other ignition issues. I've also fitted a snorkel and housed the coil in an airtight box. I know an overheating coil could cause issues but again, it doesn't feel like that's the problem - there's no high speed or high load misfiring. I also topped the gearbox fluid up so I'm wondering if perhaps it's a bit high and there's some internal drag causing the engine to stall.
Any thoughts and accompanying reasoning would be much appreciated...
When warm when letting off the throttle completely (such as when going downhill) on my 3.9 auto at over 30/40 mph the engine revs drop to <500 rpm and the engine cuts out. It doesn't do it from cold and there is no hesitation, misfiring or any other symptoms to suggest an ignition fault. The base idle is set to ~950 rpm and the ignition timing is not a million miles out.
Now I have rebuilt the distributor recently to seal it when wading and as a last resort I'll strip it and check the air gap on the reluctor but I really don't think that's the problem as I have no other ignition issues. I've also fitted a snorkel and housed the coil in an airtight box. I know an overheating coil could cause issues but again, it doesn't feel like that's the problem - there's no high speed or high load misfiring. I also topped the gearbox fluid up so I'm wondering if perhaps it's a bit high and there's some internal drag causing the engine to stall.
Any thoughts and accompanying reasoning would be much appreciated...