Pontiac 6000 engine troubles

Reply

  #1  
Old 03-27-05, 09:49 AM
sparkplug63
Visiting Guest
Posts: n/a
Pontiac 6000 engine troubles

I have a 1990 model Pontiac 6000 le with 3.1 V6 engine.It has a miss and overall rough and low speed idling ccondition..I have replaced plugs wires and coil packs.Checked for fault codes because check engine light came on but none are showing up except code 12 which is the the normal computer fault code.I was going to change fuel injectors since this engine has 160,000 on it.Im wondering about the planum I have to remove.Are there a gaskets that have to be replaced if removed.I dont know what else to check on this engine,Im at my witts end with it.Help Aaron
 
Sponsored Links
  #2  
Old 03-27-05, 10:29 AM
Member
Join Date: Feb 2005
Location: Michigan
Posts: 335
check each plug individually to make sure it is firing, you can use a tester or just hold it and ground it out on the engine and look for a spark.
 
  #3  
Old 03-27-05, 06:50 PM
bust7015's Avatar
Member
Join Date: Jul 2001
Location: Connecticut
Posts: 110
Red face

I agree. Check for spark. Before you replace the injectors, do a compression test. A burnt valve or weak cylinder will cause a rough idle or miss. If you think you'll end up replacing the injectors, you'll be replacing the upper plenum gaskets. use your vacuum cleaner because I'm sure you'll have a nest and some leaves under there. Inspect the injector wiring closely. Make sure it is intact. Get access to a niod light set to make sure each injector is recieving a signal. Injectors are expensive. Rule out all else first. Good Luck
 
  #4  
Old 03-27-05, 06:55 PM
bust7015's Avatar
Member
Join Date: Jul 2001
Location: Connecticut
Posts: 110
Exclamation

one other thing... if this miss is just at idle...you may have vacuum leak. Many times it is the PVC hose under the plenum. With the engine running, spray carb cleaner under the plenum, around the intake gasket mating surfaces, the throttle body. Listen for a change in idle for each individual area. If you have a leak, fix it. If the car runs poorly, give it a day of driving to relearn it's idle and other characteristics. If it still runs poorly, take the steps I previously mentioned.
 
Reply

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


Thread Tools
Search this Thread
Display Modes