86 Iroc 305 TPI sensor, help!
86 Iroc 305 TPI sensor, help!
I am having issue's identifying what the sensor is on the drivers side of the block between the first two cylinders. Also, advice on a GOOD repair manual and where to pick one up would great.
Re: 86 Iroc 305 TPI sensor, help!
yes, only one wire. I am having a problem with my temp guage reading. I have two sensors on the front of the engine. I replaced one that I thought was the temperature sensor but maybe this newly discovered one is my problem.
Senior Member
Joined: Dec 2009
Posts: 850
Likes: 8
From: Chilliwack BC
Car: White 1987 IROC-Z
Engine: 305 TPI LB9, 215 HP
Transmission: Borg-Warner T5 NWC
Axle/Gears: Borg-Warner 7.75 with 3.27 ratio
Re: 86 Iroc 305 TPI sensor, help!
The sensor in the driver's side cylinder head is the temp sensor for the gauge, usually has a single green wire!!

P.S. If the wire is not connected, your gauge won't work at all, if it's grounding out it will usually read high really quickly, if it's an intermittent connection, it will usually react slowly!!
Once you get the connection fixed, the sensor changed/checks out, and the wire checks out okay, if your still having problems, I would make sure that your gauge in the dash is held tightly with the screws, and not just sitting there, loose, like mine was!!
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: 86 Iroc 305 TPI sensor, help!
Here is the ultimate service manual, I have one for my 91. http://www.helminc.com/helm/product2...886&itemtype=B
Senior Member
Joined: Dec 2009
Posts: 850
Likes: 8
From: Chilliwack BC
Car: White 1987 IROC-Z
Engine: 305 TPI LB9, 215 HP
Transmission: Borg-Warner T5 NWC
Axle/Gears: Borg-Warner 7.75 with 3.27 ratio
Re: 86 Iroc 305 TPI sensor, help!
Here is the ultimate service manual, I have one for my 91. http://www.helminc.com/helm/product2...886&itemtype=B
Using the trump card!!!!
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