Engine overheats on highway with AC on

[DOUBL3 D]

Bad news. Checked compression and got an average of around 70psi for all cylinders except 5, which yielded 20psi car is currently up for sale as I need a daily driver. I will be buying another supra in the spring and doing a 1jz swap. Sad day

 

[IJ.]

Describe how you did the check.

 

[DOUBL3 D]

Describe how you did the check.

I followed the TSRM, I tried adding a few drops of oil too when we saw it wasn't yielding much psi

 

[jonahs_supra]

at 70psi on all cylinders im suprised it ran at all
i would try a different gage

 

[DOUBL3 D]

at 70psi on all cylinders im suprised it ran at all
i would try a different gage

It runs great that's the weird part, though there is a slight miss. It's just as quick as normal too

 

[IJ.]

Did you hold the throttle open?

 

[DOUBL3 D]

Did you hold the throttle open?

No

 

[jetjock]

Interesting. How can the engine breathe in enough air to compress for the short time the test is done if the throttle plate is closed?

 

[DOUBL3 D]

Interesting. How can the engine breathe in enough air to compress for the short time the test is done if the throttle plate is closed?

I think you're telling me I should go try it again...

 

[jetjock]

Well, assuming you didn't remove the throttle body like the TSRM says to (as dumb as that is) for the GE than yes, you should do it again. Remove all the plugs, hold the throttle wide open, and crank until the reading peaks.

 

[DOUBL3 D]

Well, assuming you didn't remove the throttle body like the TSRM says to (as dumb as that is) for the GE than yes, you should do it again. Remove all the plugs, hold the throttle wide open, and crank until the reading peaks.

I'll do this asap and report back

 

[IJ.]

LOL thought so, this is why I asked you to describe your procedure and why it's important that you do so in detail, NOT just say "I followed the TRSM"...

If I ask a question it's usually for a good reason, it's hard enough to diagnose an issue over the net let alone to try and do it without the correct information.

 

[3p141592654]

In his defense, if he was going by the TSRM instructions for compression testing they are pretty awful. The GTE refers to step 7 of the GE instructions, which doesn't exist, and there is nothing about keeping the throttle open either.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=21

 

[DOUBL3 D]

In his defense, if he was going by the TSRM instructions for compression testing they are pretty awful. The GTE refers to step 7 of the GE instructions, which doesn't exist, and there is nothing about keeping the throttle open either.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=21

I was wondering if that was a misprint, I just assumed they meant step 6.

 

[IJ.]

Wasn't meant as a slam, just wanted to point out we need information if we're to help people.

Lost count of the times I've asked "questions" to try and help someone and they haven't bothered their ass to answer... I wander off and never offer again.

 

[DOUBL3 D]

Wasn't meant as a slam, just wanted to point out we need information if we're to help people.

Lost count of the times I've asked "questions" to try and help someone and they haven't bothered their ass to answer... I wander off and never offer again.

I'm not taking it as a slam, I appreciate the responses from both you and JJ

 

[DOUBL3 D]

Update: got the waterneck gasket, should have it on the car mid next week. My schedule has been packed between registering for classes and putting in job apps. I'll post a pic of the gasket in a bit

 

[Nick M]

The car will not run at all at 70 psi. The Toyota repair manuals stipulates the technician knows how a compression test is done on any car.

 

[DOUBL3 D]

The car will not run at all at 70 psi. The Toyota repair manuals stipulates the technician knows how a compression test is done on any car.

I'm going to goahead and say I did it wrong then.

 

[jetjock]

...The Toyota repair manuals stipulates the technician knows how a compression test is done on any car...

This. Like all service manuals it's written for people who already have the required skills. It's not meant to be a true DIY tool.