..Rpm's drop until it dies..

AbsoluteSpeed · 07-12-2007, 05:05 AM

So this supra has a nasty habit of idling out as in when I start it if I don’t have my foot slightly on the gas the rpm's drop until it dies, which is kind of a pain with a standard. The old owner assured me that it was because of the missing muffler and a lack of back pressure. It is a family friend that seems to know enough about cars but I would hate to buy it and a new muffler and find out its something else. Does that sound right or do you think that it could be due to something else?

supramacist · 07-12-2007, 05:18 AM

Run a compression check and pull the codes.

oowee623 · 07-12-2007, 05:37 AM

happened to me before check for air leaks and tighten your intake clamps

twerb089 · 07-12-2007, 07:05 AM

slightly plug the exhaust to simulate backpressure?

88Tsupra · 07-13-2007, 02:07 AM

check your plugs and wire that can be the problem too..that was my problem and yeah check the intake piping as well mines is loose righ now and it does it buh it wont die

AbsoluteSpeed · 07-13-2007, 07:11 AM

Thanks for the suggestions I will check see what i can do.

west_side_supra · 07-13-2007, 01:36 PM

hmmm, well id agree with everyone above, check the intake pipeing, IC pipeing if its turbo'd. also check all vacume hoses. a lacking muffler wouldnt cause it to drop the rpms hell alot of us are running with no cats and 3 inch pipeing and have no problems at all. if the muffler is plugged i doubt it would cause that kind of problem, if thats the case just chop it off. and put an exhaust tip on it. its not missfireing at all? any codes? <<< you need to put a paper clip or wire or somthing inbetween termainals T and E1 of your diagnostics box in your engine compartment... does it have the stock Bypass valve?

supramacist · 07-13-2007, 02:42 PM

The tweezers from your swiss army knife, lol.

I used a 2 inch piece of 18 gauge wire that I used to wire in the Blaster coil.

cre · 07-14-2007, 07:35 AM

If it's not going into idle properly check the IDL switch in the TPS and test the ISC.

07-12-2007, 05:05 AM	#1
AbsoluteSpeed Intake Join Date: Jul 2007 Location: Edmonton AB Canada Posts: 44	..Rpm's drop until it dies.. So this supra has a nasty habit of idling out as in when I start it if I don’t have my foot slightly on the gas the rpm's drop until it dies, which is kind of a pain with a standard. The old owner assured me that it was because of the missing muffler and a lack of back pressure. It is a family friend that seems to know enough about cars but I would hate to buy it and a new muffler and find out its something else. Does that sound right or do you think that it could be due to something else?

07-12-2007, 07:05 AM	#4
twerb089 3" Exhaust Join Date: May 2007 Location: santa barbara Posts: 56	slightly plug the exhaust to simulate backpressure? __________________ 1989 supra turbo automatic soon to become a manual K&N, megan dp, gutted cat, 2 1/2" magnaflow cat back NA intake cam, shimmed actuator no A/C or P/S, therefore no ac condensor, compressor and no ps pump or resivior. gutted interior, 4 tweeters, 2 kicker 12"s powered by an MTX 400W 350rms and an audiobahn 400W 300rms

07-13-2007, 02:07 AM	#5
88Tsupra 12psi boost Join Date: Jan 2007 Location: long beach, CA Posts: 252	check your plugs and wire that can be the problem too..that was my problem and yeah check the intake piping as well mines is loose righ now and it does it buh it wont die __________________ 88turbo targa-white original Pin Stripe custom intake-Tenzo filter.....Momo racing seats and steering wheel... apexi exhaust tip-custom 3" piping. Replaced with RSR GT II NGK plug and wires HID conversion head lights HKS Turbo Timer Type-1 (in black) Tial BOV BIC DDP

07-13-2007, 01:36 PM	#7
west_side_supra 12psi boost Join Date: Sep 2006 Location: Marysville Washington Posts: 353	hmmm, well id agree with everyone above, check the intake pipeing, IC pipeing if its turbo'd. also check all vacume hoses. a lacking muffler wouldnt cause it to drop the rpms hell alot of us are running with no cats and 3 inch pipeing and have no problems at all. if the muffler is plugged i doubt it would cause that kind of problem, if thats the case just chop it off. and put an exhaust tip on it. its not missfireing at all? any codes? <<< you need to put a paper clip or wire or somthing inbetween termainals T and E1 of your diagnostics box in your engine compartment... does it have the stock Bypass valve? __________________ 7MGTE - 500hp never dyno'd exhaust: 3inch pipes no cat/powerhouse manifold/garret gt47 18psi/HKS SS racing wastegate fidenza cam gears intake: PHR 4inch intake/K&N filter/3 inch intercooler/ pipeFMIC/greddy type R bov/ fuel: 550cc PTE/ walbro 255lp / Aeromotive adj pressure regulator transmission: Fidenza flywheel/ACT extreme kit electronics: map ecu 1 / HKS EVC 9 gauges:boost,EGT,oil temp & pressure/aem AFR

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07-12-2007, 05:18 AM	#2
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Run a compression check and pull the codes.

07-13-2007, 07:11 AM	#6
AbsoluteSpeed Intake Join Date: Jul 2007 Location: Edmonton AB Canada Posts: 44	Thanks for the suggestions I will check see what i can do.

07-13-2007, 02:42 PM	#8
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	The tweezers from your swiss army knife, lol. I used a 2 inch piece of 18 gauge wire that I used to wire in the Blaster coil.

07-14-2007, 07:35 AM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If it's not going into idle properly check the IDL switch in the TPS and test the ISC.