Impala problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Chevrolet When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-18-2013, 12:31 AM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Williamalan is on a distinguished road
Default Impala problems

I have a 2001 impala with the 3.8. I've recently been experiencing a problem I can't figure out and after researching on the Internet, troubleshooting with a Haynes manual and asking multiple mechanics their opinion I am clueless. I've tried jus about everything short of replacing the PCM. The problem is I go out and start it and everything works jus fine. After about 20 seconds it starts surging really bad for about 30 seconds. Then it runs fine again for about 30 seconds and then it dies. If I try to start it after that I have to keep my foot on the gas to keep it running. So far I put new spark plugs, spark plug wires, fuel filter, fuel pressure regulator, MAP sensor, MAF sensor, IAC valve, PCV valve, throttle position sensor, I checked the fuel pressure, tested the fuel injectors, replaced the coolant temp sensor, hollowed out the catalytic converter, checked for vacuum leaks, checked all the fuses, checked all my grounds, tested the fuel pump, ran some seafoam through it. I have no clue what else it could be. Any thoughts?
Williamalan is offline   Reply With Quote
Old 08-18-2013, 05:47 AM   #2
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

It seems like its starving for fuel. Open the gas cap next time it does it and see what happens.
Mike is offline   Reply With Quote
Old 08-18-2013, 08:46 AM   #3
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

you check for vacuum leaks with carb cleaner? clean iac tb seat?
jwfirebird is offline   Reply With Quote
Old 08-18-2013, 01:45 PM   #4
Senior Member
Posts like a 4 Banger
 
ahicks66's Avatar
 
Join Date: Oct 2012
Location: Salem, CT
Posts: 114
Thanks: 0
Thanked 7 Times in 5 Posts
ahicks66 is on a distinguished road
Default

Also, it'* rare, but often the fuel system builds the right amount of physical pressure (psi), but doesn't supply enough volume (gal per min). I'm not sure how to check this other than to energize the pump for exactly a minute, pumping fuel from the tank into a jug and measuring how much gas actually flows.

But I concur with Mike, it sounds like it could be a venting problem with the tank. I'd make sure the vapor recovery line isn't plugged, it'* possible that while driving your tank gets under negative pressure because air isn't replacing the fuel removed from the tank. The working theory is a loosened gas cap, which will probably set your SES light, will allow the tank to equalize.

As always, keep us posted! And good luck!
ahicks66 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2000-2002 Impala Transmission Problems? marquette97 Lounge 5 08-07-2007 05:34 PM
Anyone have an Impala or Impala service manual 92BonneSE Lounge 7 05-28-2007 01:53 AM
Update fixed problems on The impala Masterbm Lounge 5 02-17-2006 01:06 PM
Problems, Problems, Problems... swartlkk 2000-2005 2 11-04-2005 08:57 PM
problems, problems, problems big_boss2010 1992-1999 15 04-25-2004 09:05 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:04 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.