[supra_dupra]

1990 7MGE
N/A
Manual

I was on the freeway for about an hour, got off and came to a stop sign and the RPMs dove and it quit. Was able to start it right back up but it never idled correctly again. I replaced the fuel filter, checked the dashpot diaphram and that's working fine. checked vacuum lines with carb cleaner and for any loose connections. No codes in the computer. Any ideas w/o buying expensive parts and hoping they solve the problem? The car was working perfect before my hour drive.

 

[88yoda]

maf sensor. flapper door might not be opening enough.

 

[SupraDad]

My 90' Turbo has been doing the same thing for about a month. I pulled a code 31 out of her.......MAF Sensor.

 

[supra_dupra]

Well, I replaced the MAF sensor and no luck. Anyone have any other ideas?

 

[DegreE]

Check all of your spark plugs for condition and proper gap.

 

[88yoda]

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=14

check your isc. check things out dont just throw parts at it. youll never learn anything that way.

 

[almostasoldasmycar]

My car is similar, wont idle, before i got my code scanner It was acting exactly as if the maf was unplugged, would start but then die immediately. so i checked the resistances of the afm and everythings within ranges, once I pulled the check engine code it was code 31 which says either Afm, "vaccum sensor" which im trying to pinpoint in my repair manual, tps, or the main relay that i guess controls them all. im going to check the resistances on all of these but i figured id ask in case anyone could give me a easy fix answer. As far as i can see the afm is fine as far as resistance.

 

[supra_dupra]

Ok, so I replaced the plugs since I had the thing apart to check them anyway and nothing. I started a test where you have to have the engine idling at 2500 and have E1 and FE1 jumpered and lo and behold a code popped up...a 41....TPS. So I erased the codes and did it again and then I got a 51, no 41. So where did the 41 go and why doesn't the check engine lite stay on? If I check the codes with the vehicle off, it reports no codes. Anyway, do you think it's the TPS and should I go with a used one for $33 or go for new one for $100?

 

[supra_dupra]

Well, it ended up that my header melted about a 3/4 in. hole in air induction pipe. I guess that'd do it. Now I just have to shield it so it won't happen again.