TPI Idle too high?
#1
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Car: 88 firebird
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 373
TPI Idle too high?
Just wanted to see if someone could help with a problem I can't seem to fix.
I have an 88 350 that was a 305 tbi and I swaped to TPI. I have been working out most of the bugs but one I can't seem to get. When I drive the car it has a rough idle and also when I come to a stop and put it in park it idles around 1800 and wont go down till it cools down . The car runs ok but does have a slight miss at low rpm's . I have replaced cap,rotor,wires,plugs,maf,tps,iac,coil with new injectors (24lb) and almost all the sensors and checked for vacuum leaks also set the tps and iac and set the fuel press at 50 with the vacuum line unpluged .The car is mosly stock just headers, exhaust, gears and 52mm tb and a prom to match the currunt mods. I am going to make more mods but I would like to start with a good running car first. Any help would be appreciated . thanks
I have an 88 350 that was a 305 tbi and I swaped to TPI. I have been working out most of the bugs but one I can't seem to get. When I drive the car it has a rough idle and also when I come to a stop and put it in park it idles around 1800 and wont go down till it cools down . The car runs ok but does have a slight miss at low rpm's . I have replaced cap,rotor,wires,plugs,maf,tps,iac,coil with new injectors (24lb) and almost all the sensors and checked for vacuum leaks also set the tps and iac and set the fuel press at 50 with the vacuum line unpluged .The car is mosly stock just headers, exhaust, gears and 52mm tb and a prom to match the currunt mods. I am going to make more mods but I would like to start with a good running car first. Any help would be appreciated . thanks
Last edited by lowbird; 04-16-2012 at 08:29 AM.
#3
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Car: 88 firebird
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 373
Re: TPI Idle too high?
Think that would work? I will try it. The idle is good in gear (700) .
#4
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Car: 88 firebird
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 373
Re: TPI Idle too high?
I tried that . it did not work, the screw does not even touch the bracket.
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Car: 1991 camaro RS
Engine: CharlesOdoryOB
Transmission: 82513892892
Axle/Gears: pbr disc 3.27 nine bolt
Re: TPI Idle too high?
are you useing an external tach to make sure its really idleing that high or useing the factory tach
if it was really idleing that high when you pop it in gear it would really be putting a load on the trans
my dads irocs tach is off and shows 1500 when 1st started then shows 800 in gear but really its 900 and 600 cold start and drops to 700 and 550 when warm but i checked with a external tach to see before i when searching for vac leaks and what not
if it was really idleing that high when you pop it in gear it would really be putting a load on the trans
my dads irocs tach is off and shows 1500 when 1st started then shows 800 in gear but really its 900 and 600 cold start and drops to 700 and 550 when warm but i checked with a external tach to see before i when searching for vac leaks and what not
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#8
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Car: 86 Iroc + 83 Firebird
Engine: Iroc 305 TPI, Firebird 305 4bbl
Transmission: 700r4 in both.
Axle/Gears: Iroc 3.27 Firebird 3.23
Re: TPI Idle too high?
could be a a faulty tach, one i have is a factory one, its 1k higher at all times. start, scanner reads 800, tach is 1800, ive learned to live with it.
#9
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Car: 88 firebird
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 373
Re: TPI Idle too high?
I checked that already . the engine races high you can tell it's not tach . I am starting to wonder if I was sold a bad iac motor .
#10
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Car: 86 Iroc + 83 Firebird
Engine: Iroc 305 TPI, Firebird 305 4bbl
Transmission: 700r4 in both.
Axle/Gears: Iroc 3.27 Firebird 3.23
Re: TPI Idle too high?
u should be able to adjust the iac, least set it to factory and it may help you narrow it down.
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Car: 88 firebird
Engine: 350tpi
Transmission: 700r4
Axle/Gears: 373
Re: TPI Idle too high?
Ok back at this high idle still. replaced iac and still there. Not sure where to go now I have done tps,iac,maf, collant temp sensor,set timming,02, set fuel press and tune up. I have no vaccum leaks . I have reset that iac motor 10 times and it is ok for about ten mins each time than back to a 1500 rpm idle.
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Re: TPI Idle too high?
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