tpi idle problem - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old May 2nd, 01, 07:19 AM Thread Starter
 
Join Date: May 2001
Location: mpls,mn,usa
Posts: 4
Cool

hello,I'm elfiero from mpls and I am new here
and think this is a great forum!I have a '89
305TPI with a manual trans.My problem is this
it won't idle correctly-most of the time it
idles way too fast(1200-1500)then all of a
sudden,it trys to idle down to about 500RPM
and surges or dies!It has no stored codes or
check engine light-also,the fuel milage is
bad(10-12MPG)I have replaced the following:
TPS,IAC,coolant sensor,O2 sensor,all vacuum
hoses,EGR valve,cold start injector,plugs,
wires,complete distributor,EST module,ECM,
fuel pressure reg.Now I am out of ideas and
would appreciate any help you might give me
thanks for your time!!!
elfiero is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old May 2nd, 01, 08:55 AM
Tech Team
 
Join Date: Mar 2001
Location: Wingate NC
Posts: 77
Post

If you have a bad MAF sensor it could do that. Try tapping it lightly also look inside to make sure the thin wire is still intact in the center part..
Also it may sound dumb but try disconnecting the battery for 30 seconds and then hooking it back up.
6-71BlownCamaro is offline  
post #3 of 15 (permalink) Old May 2nd, 01, 09:03 AM Thread Starter
 
Join Date: May 2001
Location: mpls,mn,usa
Posts: 4
Cool

Forgot to mention I tried 2 MAF sensors and
replaced all the intake manifold gaskets!
elfiero is offline  
 
post #4 of 15 (permalink) Old May 2nd, 01, 01:18 PM
 
Join Date: Apr 2001
Posts: 26
Post

With no codes stored, this could be difficult to narrow down. You might try cleaning the throttle body and IAC pintle. Typically, they get dirty, causing an erratic idle, surging, and dying due to its inability to smoothly control the incoming air flow. Also, make sure your TPS is working correctly, and that it is carefully adjusted to .45 volts at idle. Try these things first, then let me know what you find. Ray
RABarrett is offline  
post #5 of 15 (permalink) Old May 2nd, 01, 03:34 PM
 
Join Date: Dec 2000
Location: tacoma WA, USA
Posts: 8
Post

i dont know on tpi v8's but on my v6 it used to idle around 3000 rpms come to find out my idle air control valve was stuck shut. replaced it and idles fine now. it screws into the front of the manifold and controls the amount of vacuum that goes through a main line using a pintle thats screws in or out. Mine had 4 wires on should be to hard to fine was about 40 bucks
audioxellence is offline  
post #6 of 15 (permalink) Old May 2nd, 01, 04:55 PM
 
Join Date: Apr 2001
Posts: 85
Post

What blown said makes alot of sense, it will clear any codes if any, also this may sound dumb but is the bulb good in the check engine?

I don't know just a suggestion pretty hard to diagnose with no codes, but you already know that.
86z28 is offline  
post #7 of 15 (permalink) Old May 2nd, 01, 04:56 PM
 
Join Date: Apr 2001
Posts: 85
Post

What blown said makes alot of sense, it will clear any codes if any, also this may sound dumb but is the bulb good in the check engine?

I don't know just a suggestion pretty hard to diagnose with no codes, but you already know that.

------------------
Prowling the Streets for rustangs
86z28 is offline  
post #8 of 15 (permalink) Old May 3rd, 01, 03:24 AM Thread Starter
 
Join Date: May 2001
Location: mpls,mn,usa
Posts: 4
Post

I appreciate the info guys,I have already
cleaned out the throttle body and the check engine light does work.I guess I'll have to
take it over to TPIS in chaska,I know some-
one who works there.I'll let you know what
they find.
elfiero is offline  
post #9 of 15 (permalink) Old May 3rd, 01, 04:41 AM
 
Join Date: Apr 2001
Location: Braddock NJ USA
Posts: 13
Post

Hello there,

Here is a suggestion, my brothers 1986 Trans Am with a 305 was ideling arraticaly, so I took off the throtle positioning sensor, and the idel air control valve and cleaed them using electronics cleaner. After they dried I put them back in and it has been idleing fine ever since. (The idle air control valve had alot of carbon build on the spring and I think that is what was causing the weird idel). Just make sure to mark the position of the throtle positioning sensor because if you don't put it back in exactly the same spot it will mess your idel up. Also only use electronics cleaner, as carb. cleaner will damage the electronics. Hope that helps and good luck.

Sincerely
Dave Valentino
dave313131 is offline  
post #10 of 15 (permalink) Old May 3rd, 01, 07:05 AM
Team Member
 
Join Date: Jun 2000
Location: LaGrange,Il
Posts: 1,026
Post

I have had problems with bad connectors. Try jiggling the connector at the sensors, and ignition module and see if one has an intermittant problem.

TTFN
Mat
Mat Klemp is offline  
post #11 of 15 (permalink) Old May 3rd, 01, 02:14 PM
 
Join Date: Oct 2000
Location: Dover, DE
Posts: 10
Post

I had a similar problem with mine that turned out to be two problems. First was the fuel injectors - had them tested by the guys at www.cruzinperformance.com and all 8 of them were leaking like seives. At idle, they would "drip" more fuel than needed and cause the idle to bounce.

Second problem I had it looks like you've already eliminated - the IAC valve. Like others have said here, cleaning it really helps and it took care of my high idle.
miroc89 is offline  
post #12 of 15 (permalink) Old May 3rd, 01, 06:12 PM
Senior Tech
 
Join Date: Aug 1998
Location: abilene texas
Posts: 233
Post

elfiero (fiero with a bed? )
I had an almost identical problem when I installed a TPI motor in my el camino. Turned out that I had a massive vacumn leak at the base of the intake manifold. New gaskets & torquing it right made things much better.
There was a thread on tracking down vacumn leaks in one of the Team Camaro forums within the last week. Do a search and it should turn up.

------------------
Rick Schaefer
68 Camaro
72 El Camino
TPI350/700r4
rick is offline  
post #13 of 15 (permalink) Old May 5th, 01, 06:33 PM
Moderator
David Pozzi
 
davidpozzi's Avatar
 
Join Date: Nov 1999
Location: Central California, USA
Posts: 10,124
Post

Make sure you adjust the throttle position sensor to achieve the proper voltage signal, open and closed.
If it's mis adjusted, it will cause erratic running.
David

------------------
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Chev 350
Can Am Vintage Racer
davidpozzi is offline  
post #14 of 15 (permalink) Old May 6th, 01, 09:04 AM
Senior Tech
 
Join Date: Sep 1999
Location: Idaho
Posts: 219
Post

I have to agree with miroc89. Mine also had the same problem you are having. Turns out, just as he suggested, the injectors were leaking and/or the coils were burning up. I replaced all my injectors and no problems since. Definately give Rich a call at Cruzin!!
cardude is offline  
post #15 of 15 (permalink) Old May 6th, 01, 01:44 PM Thread Starter
 
Join Date: May 2001
Location: mpls,mn,usa
Posts: 4
Cool

Thank you for all the good ideas!I'll try
resetting the TPS next.I have had all the
injectors flowed and checked for leaks and,
I have replaced all the intake gaskets.I'll
just keep try'in stuff till I stumble on the
problem!!
elfiero is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome