96? lincoln accel problem

Reply

  #1  
Old 10-19-09, 07:02 PM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
96? lincoln accel problem

well, it's dads car so I am not positive about the year and engine size but I believe a 96 4.6L engine.

problem: when accel hard, car simply bogs down. When accel slowly, engine will follow accelerator just fine.

engine scan showed lean on left bank. no other trouble codes.

Not positive but I think I might hear a vacuum leak (didn't have a lot of time to check things out.) Dad's always in a hurry, that is why the poor accel is a big problem

anyway, any ideas would be great. Time together is limited and any ideas would help speed the dx and rx.
 
Sponsored Links
  #2  
Old 10-19-09, 08:21 PM
Member
Join Date: Oct 2009
Location: USA
Posts: 109
There is a vacuum tee that runs on the back side of the engine that were bad to crack. Check that and see if it's not falling apart.
 
  #3  
Old 10-19-09, 08:57 PM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
will do. thanks.

any other ideas, I'm game.
 
  #4  
Old 10-20-09, 06:51 AM
Member
Join Date: Oct 2009
Location: USA
Posts: 109
I don't know of any other than chasing the code(s) you got. Those tees were really a problem. I used to sell quite a few of them.
 
  #5  
Old 10-20-09, 07:32 PM
the_tow_guy's Avatar
Group Moderator
Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,519
nap - Any other symptoms that could be revealing? Gas mileage, misfiring, hard starting, anything like that?

Vacuum leak sounds feasible.

I think I would be wondering about fuel delivery maybe, too. Fuel filter changed recently? Wouldn't hurt to check fuel pressure.

In the good old days you would immediately suspect the accelerator pump in the carburetor. Nowadays that function is taken over by the computer using the various sensor inputs - MAF, MAP, TPS, etc - to determine that you need more gas delivered, but you're not getting any codes for a sensor problem. Puzzling.
 
  #6  
Old 10-20-09, 09:18 PM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
other symptoms: hunting for idle speed. It doesn't do it all the time and it only does it for maybe 15 seconds, if that, and then settles into a correct idle.

all in all, it actually runs pretty smooth. It's just that darn bogging on med-hard accel.


new fuel filter, plugs, air filter, not sure what else since my brother did that for dad.

when I get a chance, I going leak hunting (I hat hunting vacuum leaks, especially since I am getting older and it's actually harder to hear them)
 
  #7  
Old 10-21-09, 04:35 AM
the_tow_guy's Avatar
Group Moderator
Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,519
I'm thinking TPS or MAF sensor, but I would hate to just throw parts at it without some indication of a check engine code. At least the vacuum leak check is no-cost.
 
  #8  
Old 10-21-09, 07:39 AM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
I was thinking possible TPS as well. They often throw no codes since they are a variable input and as long as they read within parameters, they do not generally throw a code. That does not mean they are reading properly at any given position though.

The TPS is only about $30 so that may simply get a new one. The MAF is $130 so that may get some dx work prior to replace.

thanks again.
 
  #9  
Old 10-21-09, 07:34 PM
hopkinsr2's Avatar
Member
Join Date: Feb 2005
Location: canada
Posts: 1,561
Nap... I'm thinking fuel filter or fuel pump,,, They can't keep up to the demand of heavy acell... Can you borrow or rent a fuel pressure guage??? If so,, Tape it to the windshield & go for a drive... Fuel delivery problems can very decieving... Roger
 
  #10  
Old 10-21-09, 08:43 PM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
fuel filter is new so that is out. I'll have to hunt up the pressure gauge. I know either dad or I have one somewhere.


Just so all know; I used to work as a mechanic in a life long ago (along with a million other occupations) and dad was a lifer industrial truck mechanic (lift trucks specializing in electrics. In fact, for fun he made an S10 electric truck conversion that I towed up to Michigan from Tennessee where he built it at a friends house. It doesn't have enough range to run from Tenn to Mi) We aren't newbies but as things progress, sometimes the cure is just not as obvious, and easy, as it once was.


thanks for all the help.
 
  #11  
Old 10-22-09, 11:27 PM
Member
Join Date: Feb 2009
Location: Seattle
Posts: 2
MAF sounds like it could be the problem. I'd check voltage, ground connections, etc.

electric truck conversion sounds interesting, any pics of it or where its at now?
 
  #12  
Old 10-26-09, 05:38 AM
nap's Avatar
nap
nap is offline
New Member
Thread Starter
Join Date: May 2006
Location: north
Posts: 4,163
well, it seems a vacuum leak is not the problem. I looked and listened and fumbled around with everything and could find nothing. I pulled the plug to the idle air motor and the thing died instantly and when it was hunting, pulled it and manually ran the throttle and could get it to idle quite low so that tells me; no vacuum leaks.


guess it's time to start checking sensors but it has been so long, off to the library where we have Ford service manuals (factory stuff) which are quite complete in their processes of checks. It has been so long for me that I have forgotten how to check many of the sensors.

thanks for the ideas guys.

Oh, and kwick, the MAF is high on the list of sensors to check.
 
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
'