Author Topic: intermittent hesitation (Read 2814 times)

dudenarley · « **on:** April 18, 2011, 01:00:57 PM »

Hey guys my bros 91 318 has an off and on horrible hesitation issue (like no power between 1500 - 3500 rpms). I swapped the wires and coils from my 92 that were working well, and new plugs. cleaned under the intake and has no vaccuum leaks. also have a fuel gauge hooked up and i got good pressuse. Cleaning the Idle control valve seemed to make it run well for a about a week (better then its been in a while). Now is crapping out again. can the ICV effect the car in upper rpm or just at idle? I also havent replaced the O2 sensor in a long time. any Ideas? thanks

DesktopDave · « **Reply #1 on:** April 18, 2011, 06:02:16 PM »

Try a stomp test. Might give you some hints. I'd guess it's timing off the top of my head, but no way to tell.

dudenarley · « **Reply #2 on:** April 18, 2011, 10:35:40 PM »

Stomp came up Lambda control 1- CE light comes on intermittently with no correlation to hesitation. I unplugged the oxygen sensor and drove around a bit- it seemed a little better. Mostly the problem occurs during warmup so it's hard to pin down. It also happens with my brother driving way more then me. I'm gonna order an 02 sensor and see what happens. Thanks Dave

DesktopDave · « **Reply #3 on:** April 18, 2011, 10:40:14 PM »

The O2 sensor isn't used during warmup. It's disabled until the coolant temp is up. Not a bad idea to replace it.

Save some bucks and get a pre-cat 4-wire universal for a Ford modular V8, Mustang, EconoVan, F-150, etc. They're the same except for the wiring plug, just cut yours off & splice them with a bit of solder & heat shrink tube.

pdxmotorhead · « **Reply #4 on:** April 19, 2011, 01:23:54 AM »

My E36 (95 M42) sensor was 70 bucks from a local auto parts house with the correct plug.
There are 2 for the 318ti, one of manual trans and 1 for auto, longer cable on the Auto...

Dave

DesktopDave · « **Reply #5 on:** April 19, 2011, 04:06:09 PM »

$70 is a great deal. The Ford sensor is pretty close to that and you still have to cut & solder.

pdxmotorhead · « **Reply #6 on:** April 19, 2011, 11:36:01 PM »

I think they are getting cheaper, even though the one I bought had a generic name on the box, the sensor itself had the same Bosch number as the one I took out...

Dave