Riverman

I have a '95.5 with 2.7 motor. I am trying to test the TPS to track down my hot start issues.

When checking the TPS resistances, I cannot get any reading off the IDL pin.

Does this mean that my TPS is bad, or just that it needs to be adjusted?

Thanks-

raretaco02

Are you sure you have your 5 volts com in in

Riverman

You don't check voltage on these older ones, you check resistance. I'm sure I'm using the ohmmeter correctly. I'm getting resistance readings for the other posts in the connector, just not the IDL post.

Just wondering if that means a bad sensor, or just a sensor that needs to be adjusted. The manual is vague on that point.

raretaco02

Sry didn't see what model and that it was a 4 cylinder I'm not sure about that honestly . Do u not have a friend that has a truck like yours u can check

raretaco02

I think you should have a 12 v constant and a ground then your resume wires but on my 3.4 it does have some resistance at idle . Are you checking with engine e running or not

raretaco02

Forget everything I said man my bad I was thinking bout mas lol sry would you like for me to test mine and see

Riverman

Yeah, if yours is a 2.7 from 95-97, it should be the same TPS and same test. The test is to put a feeler gauge between the throttle stop screw and the lever and then check resistance on the sensor side of the connector. You want to test resistance across the bottom two posts in the connector. Gaps (throttle stop) are .022 inches and .029 inches. One gap is supposed to give something less than 2.3k ohms across those two connector posts, and the other is supposed to give infinity ohms, but I get no reading on either one.

Thanks for any help!

raretaco02

Mine is a 3.4 but I can check my Buddys in about an hr when he gets here I'll see what I can fig out . I don't think your tips is your prob though . Usually it will have a dead spot in it some where and it will make it idle down not up and it don't throw any codes

Riverman

It may not be the problem, but I've read two different reports online of people having the same problem as me and the same code and fixing it by adjusting or replacing the TPS. Since the other option is to replace my distributor for $500, I'd rather rule out the TPS first since it's not testing right according to the manual. Adjusting the TPS just takes a screwdriver, and replacing it is only $100. Either one of those is much better than dumping $500 down a distributor and then finding out the problem was a $100 sensor.

Let me know if you figure anything out on your buddy's truck.

raretaco02

Well his truck threw a code for tps along with a bunch more so I never even attempted it cause who knows what it would read lol I'm trying to help you but I'm not sure how I can without another 2.7 . Every yota I know is a 3.4 round these parts

raretaco02

Have you checked your temp sensor

Riverman

As a follow-up....I pulled the throttle body, cleaned it (it was NAzZzTY), cleaned the IAC, and adjusted the TPS to match manual spec. It all tested out and was fine, and my hot start issues seem to have been cured. Unfortunately, I am still pulling the CPS code (p0340) and have the check engine light on - so I can't get my Taco rehab project to pass the smog test yet. I've ordered a distributor and plan to swap it (that sensor is in the dist. on these models)....I will let you know if that clears the code.

raretaco02

Cool maybe you can get that light off . I'm used to mine being on from no converters lol