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02-22-2009, 10:34 AM
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#1
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Join Date: May 2005
Location: Dumont
Posts: 231
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TPI rough idle problem please HELP!
91 Z28 w/ 305 TPI has rough idle and at idle if throttle is cracked it bogs then idle goes up.Sometimes it pops out of the TB. I've changed the following:
spark plug wires,egr,new distributor w/ cap,rotor and module,map sensor.TPS senser,oxygen sensor,have fuel pressure guage(pressure holds when ignition turns on does not drop),timing is set,and new coil(MSD) any ideas I am stumped!!!
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02-22-2009, 07:07 PM
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#2
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10 Second Club
Join Date: Aug 2005
Location: lake hopatcong
Posts: 331
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sounds like ur dist. is one tooth off
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TMR performance
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02-22-2009, 07:36 PM
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#3
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Join Date: May 2005
Location: Dumont
Posts: 231
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it was doing it before i replaced the distributor. thanks for the reply.
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02-22-2009, 07:39 PM
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#4
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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could be the IAC..(Idle Air Control valve) You could try cleaning it first with carb cleaner before buying a new one.
edit: When you raise the rpm's do they stay up or come back down?
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1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
Last edited by Teds89IROC; 02-22-2009 at 07:44 PM.
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02-22-2009, 07:50 PM
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#5
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10 Second Club
Join Date: Aug 2005
Location: lake hopatcong
Posts: 331
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how many miles are on this engine? also if its popping out the tpi i wouldnt rule out a bad lifter or timing chain and gear issue
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TMR performance
Last edited by camaroAL; 02-23-2009 at 09:39 AM.
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02-22-2009, 08:30 PM
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#6
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Join Date: May 2005
Location: Dumont
Posts: 231
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i forgot to mention i cleaned the IAC and changed the fuel filter, the rpms stay up. they do not drop down. the car has just over 82000, i was thinking i might have a bad injector, but i don't know how to test the injectors.
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02-22-2009, 08:32 PM
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#7
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10 Second Club
Join Date: Aug 2005
Location: lake hopatcong
Posts: 331
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when my computer went bad i had this prob. also
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TMR performance
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02-22-2009, 08:35 PM
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#8
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Join Date: May 2005
Location: Dumont
Posts: 231
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how did you determine it was the computor? did you do a test w/ a volt meter on the computer?
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02-22-2009, 08:58 PM
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#9
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10 Second Club
Join Date: Aug 2005
Location: lake hopatcong
Posts: 331
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i had checked everything else possible, dist, cap, rotor,plugs,wires,timing, iac,sensors.etc... and luckily i knew someone with the same car, i tried the computer and bingo.. so i threw out my tpi and went to a carb.
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TMR performance
Last edited by camaroAL; 02-23-2009 at 09:39 AM.
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02-23-2009, 08:39 AM
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#10
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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I had this problem with the t-bird months ago except for the popping. I cleaned the IAC and it did nothing. I replaced the IAC and that was it. Are you throwing any codes?
__________________
1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
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02-23-2009, 09:31 AM
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#11
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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checked for vacuum leaks?
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02-23-2009, 04:23 PM
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#12
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Join Date: May 2005
Location: Dumont
Posts: 231
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i have no codes and i also checked for vaccum leaks. i also sprayed carb cleaner around the intake.
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02-23-2009, 10:21 PM
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#13
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Join Date: Aug 2004
Location: North Jersey
Posts: 3,047
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Jay, make sure the plug wires are in the right order, and check the battery voltage with the car running. If the ECM isn't receiving the proper voltage, it may do wacky things.
Also, I know you said you changed your ignition module, but it's possible the new one is bad, or the pickup coil in the distributor could be bad. Let us know what you find!
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Seeya,
Steve R. in North Jersey
'16 Go-Mango Dodge Charger R/T. It's so good to be back in a V8-powered, RWD car!
Former Toy - '88 Monte SS - had lots of mods...
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02-23-2009, 10:23 PM
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#14
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Join Date: Jul 2008
Location: NJ
Posts: 819
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Theres plenty of hoses throughout the engine compartment that could be leaking vacuum. It may help if you unplug some of the manifold connections and plug the manifold with a cap and see if theres any differences, or look at any questionable hoses.
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Last edited by 91chevywt; 02-23-2009 at 10:23 PM.
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02-23-2009, 10:28 PM
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#15
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Join Date: May 2005
Location: Dumont
Posts: 231
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hey steve, i installed a complete brand new billet distributor. it came w/ everything and i checked the plug wires. it does the same thing before i installed new wires and distributor.i also have a new battery.
thanks for the ideas.
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