Cam Position Sensor, Crank Sensor, Balancer

[DAVID C]

Are there any other cars that use the same Cam position sensor, Crank position sensor, and harmonic balancer as my '87 GN? How about the FWD models? Dave C.

[turbofish38]

The cam sensor and balancer are 84-87 Turbo only(89 TTA also) but the crank sensor is the same on 86-88 FWD with the 3.8 FI motor VIN code 3(8th character of VIN). Make sure you get it with the mounting bracket as there are 2 styles depending on whether it is OEM or a replacement.

[DAVID C]

Thanks. I also need a map sensor and the ignition control box (the one on the passenger side fender. I picked up a couple of the ignition boxes, but the #s are different. Dave c.

[turbofish38]

The stock MAP sensor(2 BAR) is the same for any turbocharged or supercharged GM model. Look for late 80's 4 cyl turbo Sunbirds or 91 and later S/C Park Ave/Bonnevilles. The 3 BAR was only used on the TTA. The knock module is turbo SFI Buick only. The 87 is different than the 84-86. I cant remember the difference but there have been a couple of post about it so you might try do do a search unless they got deleted during the last couple of months.

[DAVID C]

Thanks again.

[ijames]

The knock module is turbo SFI Buick only. The 87 is different than the 84-86. I cant remember the difference but there have been a couple of post about it so you might try do do a search unless they got deleted during the last couple of months.

If by knock module you mean the esc module on the passenger fender, Tom Chou (of AC/Delco ecm calibration and Thrasher chip fame) once posted on the gnttype list that the 84-86's used a 4 pole filter, then gm decided it didn't need to be that good so the 87's got a (cheaper to make) 2 pole filter with the same center frequency and 3 dB bandpass. So basically they are interchangeable. One has "HKP" on the label, and the other "BLO", but I forget which is which, sigh :-).

[DAVID C]

I knew that '86 was different than '87. I swapped them between my 2 cars (see sig) for diagnostic reasons. Different #s, but they seemed to perform the same......That reminds me, I need to change them back Dave C.