99 grandprix gt engine issues - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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

Reply
 
 
 
Thread Tools Search this Thread
Old 11-28-2011, 06:50 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2011
Location: sacramento california usa
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
danneybo is on a distinguished road
Default 99 grandprix gt engine issues

i have a few issues. i figured out the majority of them...i have a 99 gp gt 168,000 miles thats moveing sluggishly, when i first start the car up and pull off into the main road it accelerates funny...it spurts power out as if im pressing the gas over and over again. i can see it on my rpm gadge it literally climbs one notch after another in gradual spurts. ive gotten my spark plugs replaced, i have cleaned out my injectors aswell. i am planning on installing new ignition coils and replaceing the fuel filter. WHAT do u think the problem is? i would appreciate the help.
danneybo is offline   Reply With Quote
Old 11-28-2011, 10:49 AM   #2
Senior Member

True Car Nut
 
sseidriver97's Avatar
 
Join Date: Mar 2010
Location: Portage mi
Posts: 7,124
Thanked 3 Times in 3 Posts
sseidriver97 is on a distinguished road
Default

It sounds like a heavy misfire...i always check by starting the car and pulling the plug wires off 1 at a time to see if the way its running changes at all..and if it starts to run funny on 5 cylinders but has no change on one of them youve found your issue.But be careful because bad spark plug wires can zap ya..also one other test you can do is to make sure your MAF is functioning correctly by unplugging it as your car is running.It may stumble and die if so just restart it and see if it runs better.take it for a test drive if you have to just dont beat on it to much
sseidriver97 is offline   Reply With Quote
Old 11-28-2011, 11:19 AM   #3
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

If your car is misfiring that badly the check engine light should be on, and probably flashing. Take your car to autozone or someplace like that and they will read your car'* diagnostic trouble codes for free. Post the DTC'* back here and we can help you track down and correct the issue(*).
2kg4u is offline   Reply With Quote
Old 11-28-2011, 12:06 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2011
Location: sacramento california usa
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
danneybo is on a distinguished road
Default

My 'service engine soon" light is on but its because of the coolant leak i developed a week ago..and unfortunately in sacramento california our kregens and autozones usually dont read your obd2 codes...infact they try very hard not to come out from behind their counters. but the car has done this since i bought it 4 mounths ago. today i will check the plug wires and maf. SHOULD i go head and check my FPR aswell?
danneybo is offline   Reply With Quote
Old 11-28-2011, 12:27 PM   #5
Senior Member

True Car Nut
 
sseidriver97's Avatar
 
Join Date: Mar 2010
Location: Portage mi
Posts: 7,124
Thanked 3 Times in 3 Posts
sseidriver97 is on a distinguished road
Default

might as well while your there pull the vaccumn line off and if u smell alot of gas its bad
sseidriver97 is offline   Reply With Quote
Old 11-28-2011, 03:11 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2011
Location: sacramento california usa
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
danneybo is on a distinguished road
Default

just checked the fuel pressure reg and got a pretty strong smell when i put my nose to da vacuum line. i also took my oil cap off and noticed some water droplits in it. its been really foggy for the past week or so and pretty cold aswell..is this something i should worry about?
danneybo is offline   Reply With Quote
Old 11-28-2011, 04:25 PM   #7
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

the fpr is bad if you smell gas. i wouldnt worry about the water at this point, look on the oil dipstick water whitish stuff and in the coolant maybe.
jwfirebird is offline   Reply With Quote
Old 11-29-2011, 12:26 AM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2011
Location: sacramento california usa
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
danneybo is on a distinguished road
Default

im gonna order a new fpr this weekend. im also experienceing bad fuel economy. i have a leak in my coolant elbows aswell. will a bad fpr and a coolant leak change my fuel economy.??
danneybo is offline   Reply With Quote
Old 11-29-2011, 07:28 AM   #9
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

its pretty likely, the fuel pressure is not optimum if the fpr is bad.
jwfirebird is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1997 grandprix gt 3.8 lowpontiac Introductions for new members 6 08-19-2007 01:31 PM
GrandPrix 3.4L dohc cam sensor SSEimatt93 Lounge 0 12-23-2006 11:18 AM
GXP Grandprix pontiacGXP Bonneville GXP/ Northstar Powered Cars 10 07-28-2005 09:27 PM
GrandPrix GT Coupe 1995SESC495HP Lounge 4 06-11-2005 02:40 PM
Will 04 GrandPrix fogs fit on a Bonnie? 1993bonnie General GM Chat 3 02-26-2005 04:45 PM


Tags
fuel filter, fuel injectors, grand prix, gt, ignition coils

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 03:09 AM.


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.