eyeball kid

I'm new to the 951 (mine is an 88 with 75k) and am trying to learn as quickly as I can. I gather the reference sensors are suspect at best; therefore, does anyone have a write up on checking the sensors soundness and pictures of location? Anything in particular to look for as warning sign of impending failure?

bigdeano

The sensors are a cause of many cold start problems. You can see the connectors for the sensors at the rear of the back of the intake manifold one of top of the other. The wires run down to the bellhousing for the clutch. Not sure there's a sound way of checking the sensors because there's a myriad of problems that can be the result of failing sensors.

ehall

If you're not having a starting issue, leave them alone. They are better left unmolested if they are not causing a problem. Once you start messing with them, if they are old, your problems will multiply, until you do a total replacement, or serious repair.

quinnfiske

You should get to know Clarks Garage web site. Has lots of good information. Look under "Garage Shop Manual" for a list of topics. There has been a myriad of threads here dealing with the same topic.

http://www.clarks-garage.com/

eyeball kid

Thanks I like the leave it alone advice. I also like to know what to look for when things start going wrong.

quinnfiske

Starting problems are quite common. You jump in and it cranks and cranks and no start. This can be intermittant which adds to the fun. It will be fine for days or weeks and it won't start one day. When this happens, a good start is to wiggle the connectors which are located between the cylinder head and the firewall.

jerome951

If your tach stops jumping when you're trying to start it, then check them out.