Ford Experts, I need your help. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Lounge For casual talk about things unrelated to General Motors. In other words, off-topic stuff. And anything else that does not fit Section Description.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-16-2007, 11:37 AM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
wjcollier07 is on a distinguished road
Default Ford Experts, I need your help.

Ok, well here we go again with one of my friend'* fords

This is a 1989 Mercury Grand Marquis LS with the 302.

It will run fine when its cold and runs strong and smooth, but when it gets warm, it stutters, misses, and surges. And if you put it into gear without holding the RPMs up with the accelerator, it will stall.

Heres the huge problem. It barely moves. I mean once its in gear, its ok, but like if you go like from a stop sign, it BARELY moves. Like, absolutely PEDAL to the METAL it will barely get to 40.

When we got it going, something was seriously wrong, the exhaust got SO hot, that the insulation above the cats was smoking. Like, nearly on fire. We looked like a fireball going down the road.

What could be the possible problems? Before it sat for nearly a year to rebuild the engine (don't ask), it ran fine!!! It got rebuilt because of a little piston slap. And a couple other things. But otherwise, fine. We're all stumped. the guy that rebuilt the engine recently recieved his ASE certification, and he knows he didn't screw anything up.

Help please!
wjcollier07 is offline   Reply With Quote
Old 01-16-2007, 11:44 AM   #2
Senior Member
Certified Car Nut
 
Join Date: Jul 2003
Location: Robbinsdale, MN
Posts: 15,408
Thanks: 0
Thanked 0 Times in 0 Posts
MOS95B is on a distinguished road
Default

My first guess would be a leaking or misrouted vacuum line, since both systems listed are vacuum based.
MOS95B is offline   Reply With Quote
Old 01-16-2007, 11:59 AM   #3
Darrel
Guest
 
Posts: n/a
Default

Thats the same thing i thought too, but i have no idea why it got so hot...
  Reply With Quote
Old 01-16-2007, 12:01 PM   #4
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Clogged catalytic converter FTW. All your symptoms point to it. Get it checked.
willwren is offline   Reply With Quote
Old 01-16-2007, 12:02 PM   #5
Senior Member
True Car Nut
 
Join Date: Jan 2005
Posts: 3,295
Thanks: 0
Thanked 0 Times in 0 Posts
MyLittleBlackBird is on a distinguished road
Default

if the cats are getting hot.... plugged cats.... maybe....

*edit* damnit Wren, you beat me to it
MyLittleBlackBird is offline   Reply With Quote
Old 01-16-2007, 12:05 PM   #6
Senior Member
Posts like a Turbo
 
Join Date: Oct 2006
Posts: 450
Thanks: 0
Thanked 0 Times in 0 Posts
ieatfeets is on a distinguished road
Default

unhookem and run it if it runs strong you know your problem is deffinatly the cats. even though it is its fun to hear a open manifold 302 everyonce in a while
ieatfeets is offline   Reply With Quote
Old 01-16-2007, 12:19 PM   #7
Senior Member
Posts like a Northstar
 
Join Date: Oct 2004
Location: Purgatory
Posts: 533
Thanks: 0
Thanked 0 Times in 0 Posts
Greyhare is on a distinguished road
Default

It could also have an issue when it goes into closed loop. (warms up)
That could be an O2 or MAF.
Greyhare is offline   Reply With Quote
Old 01-16-2007, 12:19 PM   #8
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

An old O2 can kill a cat.
willwren is offline   Reply With Quote
Old 01-16-2007, 12:33 PM   #9
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

That should be a 4-wire O2 sensor.

Check the coil as well. Mine went out on my truck and I saw similar symptoms
Cheetah is offline   Reply With Quote
Old 01-16-2007, 12:42 PM   #10
Senior Member
True Car Nut
 
Join Date: Aug 2004
Location: In your garage, swipin' da lug nutz
Posts: 3,067
Thanks: 0
Thanked 0 Times in 0 Posts
sandrock is on a distinguished road
Default

I was thinking cat too...I messed with this 89 Cougar that had clogged cat issues...and it had 2 cats, one for each bank IMS.
sandrock is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
HELP HELP HELP, EXPERTS PLEASE !! statusplease 1992-1999 8 03-15-2008 06:49 PM
Ford experts/Transmission experts/Experts in general(ANYONE) MyLittleBlackBird Lounge 13 02-03-2007 08:47 PM
Takes On a Winter Beater (Ford experts) fantastic88 Lounge 28 06-03-2006 12:11 PM
Motorcycle experts need some help...... killer_cr80r Lounge 3 06-08-2004 01:31 AM


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 09:30 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.