305 TPI idles high when cold - Pirate4x4.Com : 4x4 and Off-Road Forum

ManglerYJ · 10-17-2001, 07:35 PM

I'm looking to figure out why my TPI 305 is idling so high. It idles way high upon startup (like 2500) and comes down to like 1200. It does that after driving for any distance, too. If you rev the engine, it settles to about 1000. It should be about 7-800 at idle. Is there an adjustment I can make? Everything seems to be computer controlled. It seems to be worse when idling into a head wind. I do have a cone K&N filter on the front of the throttle body.

HELP!!!

Thanks in advance! By the way, it's out of a 92 Firebird Formula and I have the painless wiring harness and chip in the stock computer.

Matt <IMG SRC="smilies/blender.gif" border="0"> <IMG SRC="smilies/blender.gif" border="0"> <IMG SRC="smilies/csmile.gif" border="0">

mudrunner78 · 10-18-2001, 01:54 PM

sounds to me that your map sensor has gone, You can buy a tpi tech manual from any auto parts store, that and a volt-meter you can diagnose just about everything. Hope this helps.

hy_desert_4wheeler · 10-19-2001, 05:11 AM

Sounds like your throttle position sensor is either out of adjustment or has gone bad.

iroc-cj · 10-19-2001, 04:48 PM

Mine does the same thing, part of my problem is that my throttle blades won't always close all the way. do you have access to a scanner, if not find one, then you can compare target idle to actual idle.
This web site has lots of good info on TPI's http://www.thirdgen.org or http://www.thirdgen.org/new design/tech/promintro.shtml try it you WILL like it. <IMG SRC="smilies/biggrin.gif" border="0">

[ 10-19-2001: Message edited by: iroc-cj ]

[ 10-19-2001: Message edited by: iroc-cj ]

10-17-2001, 07:35 PM	#1 (permalink)
ManglerYJ Registered User Join Date: Jul 2001 Member # 5744 Location: Ruffin, NC Posts: 336	305 TPI idles high when cold I'm looking to figure out why my TPI 305 is idling so high. It idles way high upon startup (like 2500) and comes down to like 1200. It does that after driving for any distance, too. If you rev the engine, it settles to about 1000. It should be about 7-800 at idle. Is there an adjustment I can make? Everything seems to be computer controlled. It seems to be worse when idling into a head wind. I do have a cone K&N filter on the front of the throttle body. HELP!!! Thanks in advance! By the way, it's out of a 92 Firebird Formula and I have the painless wiring harness and chip in the stock computer. Matt <IMG SRC="smilies/blender.gif" border="0"> <IMG SRC="smilies/blender.gif" border="0"> <IMG SRC="smilies/csmile.gif" border="0"> __________________ 90 YJ with 305 TPI Chevy/ SM465/ Dana20, SOA on Scout Dana44's on 36x12.50 SX's with a Lock Right in the rear visit [url]www.carolinarockshop.com [/url] today, tell em Mangler sent ya!

10-18-2001, 01:54 PM	#2 (permalink)
mudrunner78 Registered User Join Date: Jul 2001 Member # 6105 Location: cadiz ky Posts: 188	sounds to me that your map sensor has gone, You can buy a tpi tech manual from any auto parts store, that and a volt-meter you can diagnose just about everything. Hope this helps. __________________ 78 chevy under construction, 454/350/205 60/70 5.89s 39.5 boggers 78 f150 351M/435/205 44hp/9 36's swampers 85 F350 460/c6/1356 60/70 4.10s 33's

10-19-2001, 05:11 AM	#3 (permalink)
hy_desert_4wheeler Registered User Join Date: Jan 2001 Member # 2790 Location: Stinnett Tx USA Posts: 1,629	Sounds like your throttle position sensor is either out of adjustment or has gone bad. __________________ Russ hy_desert_4wheeler 46 Dodge WC15--67 M715--85 Jeep CJ10A--06 Dodge Ram2500Quad cab Cummins--94 Suburban--06 Ridgeline-

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10-19-2001, 04:48 PM	#4 (permalink)
iroc-cj Registered User Join Date: Jun 2001 Member # 4985 Location: Minnesota Posts: 133	Mine does the same thing, part of my problem is that my throttle blades won't always close all the way. do you have access to a scanner, if not find one, then you can compare target idle to actual idle. This web site has lots of good info on TPI's http://www.thirdgen.org or http://www.thirdgen.org/new design/tech/promintro.shtml try it you WILL like it. <IMG SRC="smilies/biggrin.gif" border="0"> [ 10-19-2001: Message edited by: iroc-cj ] [ 10-19-2001: Message edited by: iroc-cj ]