350 TPI Knock Sensor Interchange w/ 350 TBI Knock Sensor?
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Joined: Sep 2000
Posts: 560
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From: Austin TX
Car: 91 RS Convertible
Engine: 355
Transmission: 700R4
Axle/Gears: 2.73 peg leg
350 TPI Knock Sensor Interchange w/ 350 TBI Knock Sensor?
There seems to be some ambiguity about this. Autozone shows a PN of SU169 for a wells unit that is for the 1991 350 TBI trucks as well as the 1991 350 TPI SD cars. Anyone know if they are interchangeable as long as the engine size is the same? I bought a TBI 350 knock sensor many years ago for a TBI swap and it is currently installed in my block. I am know going TPI and am wondering if I need a TPI-specific sensor.
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 350 TPI Knock Sensor Interchange w/ 350 TBI Knock Sensor?
Measure the resistance of it. The 85-89 TPI sensors are 100k ohms, and the 90-92 TPI sensors are 3900 to 4400 ohms. If it measures 3900 to 4400 ohms, you're fine.
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Joined: Jan 2003
Posts: 1,931
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From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Re: 350 TPI Knock Sensor Interchange w/ 350 TBI Knock Sensor?
In the TPI's there is also a differance in the 5.0 to 5.7 L knock sensors
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