Idle/rev problem?

[1988_supra]

whats up sm? i have a 1990 supra 7mgte, my car would idle at around 500 rpms for about 30 seconds and then jump up to around 1100 and rev there for about 30 seconds and it would just keep jumping around, my cel was on and the code was 51 (tps) so i changed it my code is off but car is doing the same thing? also when i rev the car after rpms drop down it wants to stall my bov is to the atmosphere i understand that but i only rev the car to about 1500 rpms and let go of gas it wants to stall does the bov do it at low rpms as well? any help would be great thanks everyone

 

[hvyman]

You need to adjust the tps.'

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=101

Hint: Misadjusted tps may not throw a code.

 

[87Burg7mgte]

i have a similar issue...seems you have to set that tps just right. i have the same setup with my bov and get the same stalling problems so im assuming this is normal.

 

[hvyman]

Normal for you.

Not normal for me.

You have some other problems hiding somewhere.

 

[SupraCorwin]

Hvyman is right, adjust the tps and go from there.

The only way your BOV could stall your car at that low rpm is if it was leaking. (possible, but unlikely given your situation.)

 

[1988_supra]

checked for codes today because my cel is on i got codes 13 and 52 i know 52 is knock sensor but what is 13?

 

[hvyman]

cps and circuit. I would look into fixing both of those asap.

 

[1988_supra]

alrite i go the cps, and as for the knock sensor they both seem to be in good shape from what i seen today could there be another reason why my code 52 went on? my dad drove the car and put regular gas in and not v power about 2 weeks ago but would that light come on for that?

 

[hvyman]

The sensor usually dont go bad as much as the wiring itself. Somewhere from the plug to the ecu there is a problem. Esp if your harness has seen better days,

A) you could just run the wiring ziptied to the main harness or
b) You could remove and replace with good harness or
C) Take harness off remove and replace any damaged sections of wires and replace the knock sensor wiring and re loom it making it pretty and working good again or
D) send the harness to someone to fix. (I do wiring and so do other people.)

 

[1988_supra]

thanks for the help amn as soon as i get the cps in ill let you guys know if problem still occurs thanks