I have a '92 Fox and I'm currently dealing with a strange timing issue. I recently purchased a heads/cam/intake motor for my car and got it installed. For some reason, with the SPOUT connector out, the timing is advancing itself physically once the engine idles for about 15 to 20 minutes and is fully warmed up.
I have tried swapping out the TFI module, but that did not fix the problem. I reused my original Motorcraft distributor, which did not seem to have any issues on my stock motor. Could the PIP sensor be causing this strange issue? I don't want to just throw random parts at this thing in hopes of fixing it.
no vacuum readings it does hunt on cold start but not warmGot any vacuum readings?
Does the RPMs hunt around a little after warmup?
Considering the TSP plays a direct role in controlling the ignition timing advance, I would sort that and the IAC out before any continued tail chasing on the timing anomaly.
In order for a properly set base idle, you need a functional IAC. For proper timing control the base idle should be set and the associated TPS voltage needs to be within the correct range.
I know you’re thinking that because the condition happens when the spout is pulled, that means the throttle body issues are irrelevant. But do we “know” that? Perhaps the EEC is entering a base setting mode because it’s not getting the correct signals from the TPS, IAC etc….
Sort out and correct the TB and any other known issues before chasing the unknown cause of the timing advance.
That definitely makes sense. I have been trying to set the IAC and the TPS in the correct range, but I do not get a lot of time before the timing starts extremely advancing itself to the point where I have to shut it down and let it cool off. Last night, while I was setting the idle after replacing the TFI in hopes it would fix the issue, the RPMs shot up and the car started to run badly. When I checked the timing mark, which was originally set at 12 degrees, the mark was pegged past 40, so I quickly shut it down. This is the first Fox I have ever owned, and also the first time swapping an engine. I apologize for my lack of knowledge; I kind of dove head first into this project. Also to add when removing or reconnecting the spout I do see and hear a change.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?