Starts for a second, then dies unless I give gas - Ford Truck Enthusiasts Forums



1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Starts for a second, then dies unless I give gas

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-29-2008, 11:37 AM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
Starts for a second, then dies unless I give gas

My father in-law has a 1998 Lincoln Navigator with 160k miles. He brought it to my house so I could change his P/S pump which was making noise at low RPMs when turning the wheel. No biggie, right? So, all I do is move intake plastic out of the way, take off the fan/shroud, remove belt, pull off P/S pulley, disconnect P/S pressure hose, remove P/S pump, install new pump and new pressure hose, install pulley, put on new belt, put on fan/shroud, replace intake system, start truck. Here's the problem.

The truck starts for a split second like normal and then just dies. If I give it gas, it will run at whatever RPM I give it, so it is getting gas and has good ignition. When I let off the gas, it drops to around 100-200 RPM and will sometimes jump up to 1000-2000 RPM for a second like a surge and then back down to the 100-200 RPM range and then just die. No CEL when its running, either. So, now the truck is immobile at my house and I look like a crappy son-in-law know-it-all shadretree mechanic!

I searched the internet and found a few fixes for this description, so this is what I tried:

I disconnected the battery and reconnected to try and reset the idle trim, no luck.

I removed the IAC valve and cleaned it and moved the mechanism back and forth, no luck.

I removed the PCV hose system that goes from the passenger valve cover then Y's to the either side of the throttle body and inspected for leaks, none found. The PITA one on the back of the intake where it goes from skinny to wide hose is OK too, and mine doesn't make an elbow, it just reduces straight.

I wiggled and disconnected and reconnected my crank position sensor, no luck.

I cleaned my MAF with MAF cleaner, no luck.

Now, without a CEL, I am kind of at a loss here. Any suggestions?

I've posted this in the 5.4L forum as well...
Reply With Quote
  #2  
Old 09-29-2008, 12:15 PM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 12,821
projectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant future
Replace the IAC valve.
Reply With Quote
  #3  
Old 09-29-2008, 01:32 PM
alloro alloro is offline
Post Fiend
 
Join Date: Apr 2008
Location: 0,0,1
Posts: 13,116
alloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to behold
I assume it was running fine before you pulled it apart? If so, I'd say you have an air leak in the air intake ducting after the MAF sensor, or your connection to the MAF has been lost.
Reply With Quote
  #4  
Old 09-29-2008, 01:41 PM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
Yeah it was running fine. Drove about 45 mins to get to my house. He had it in park and moved the wheels back and forth so I could hear the P/S pump make its god-awful sound, and then we pulled it into the garage so I could work. I didn't touch anything besides what I described, which is why I am so pissed about this. Wouldn't a faulty MAF connection throw a code and CEL though? I couldn't get the MAF sensor to disconnect under the air filter, so I just kind of laid it there out of the way. Think I may have loosened a wire in the MAF sensor connector inside the plastic tubular housing??
Reply With Quote
  #5  
Old 09-29-2008, 03:46 PM
pdqford pdqford is offline
Postmaster
 
Join Date: Jan 2001
Location: Central NYS
Posts: 2,677
pdqford has a good reputation on FTE.pdqford has a good reputation on FTE.
Try unplugging the MAF connector and plugging it back in again.
Reply With Quote
  #6  
Old 09-29-2008, 04:01 PM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
Now I've heard of people unplugging the MAF and turning on the truck to see if it runs better. If when plugged in it runs bad, you know its faulty. Should I do that? Or should I just unplug and replug and then start?
Reply With Quote
  #7  
Old 09-29-2008, 04:04 PM
alloro alloro is offline
Post Fiend
 
Join Date: Apr 2008
Location: 0,0,1
Posts: 13,116
alloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to behold
First try the unplug/replug/start method first.
Reply With Quote
  #8  
Old 09-29-2008, 04:13 PM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
Guess I have my marching orders!! Thanks guys, and I will report back tonight after I try this. I really wish it would've thrown a code to tell me this though.
Reply With Quote
  #9  
Old 09-29-2008, 05:50 PM
Monsta's Avatar
Monsta Monsta is offline
Post Fiend
 
Join Date: Oct 2001
Location: The Island of Maui
Posts: 18,306
Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.Monsta has a spectacular reputation.
A bad MAF or MAF connection will set the check engine light.
Reply With Quote
  #10  
Old 09-29-2008, 06:57 PM
pitrow pitrow is offline
Elder User
 
Join Date: Mar 2005
Location: Cornelius, Oregon
Posts: 878
pitrow is starting off with a positive reputation.
sounds dumb, but are you sure the "new" ps pump isn't bad? If it's dragging it could be putting enough strain on the engine that it won't idle, but you can overcome it by giving it gas. I'd try taking off the serpentine belt and firing it up for a little bit (not more than a minute or so) and see if it'll idle then. Is it possible that you hooked the P/S hoses up backwards? I doubt that because they should be different fittings, but just a thought.

Anyway, try taking off the serpentine belt to eliminate the P/S system causing problems.
Reply With Quote
  #11  
Old 09-29-2008, 08:10 PM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
well I thought the new belt was too tight so I put the old stretched out belt back on with no change. The new pump turned fairly easily by hand so I doubt its that. I will certainly try your idea if I can't get the MAF ideas to work...
Reply With Quote
  #12  
Old 09-29-2008, 09:30 PM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
bad MAF connection! I wiggled the wires that are going into the plug that connects onto the MAF, and the truck started, although it kept surging. So I tried and move the wires enough to allow a steady idle, and it did. Now I just need to make it stay without me touching it. That plug isn't the easiest to work with. Can that whole connection line be purchased?
Reply With Quote
  #13  
Old 09-29-2008, 09:40 PM
c_hohensee c_hohensee is offline
Elder User
 
Join Date: Feb 2006
Posts: 841
c_hohensee is starting off with a positive reputation.
You might try a junk yard.
Reply With Quote
  #14  
Old 09-30-2008, 03:20 AM
alloro alloro is offline
Post Fiend
 
Join Date: Apr 2008
Location: 0,0,1
Posts: 13,116
alloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to beholdalloro is a splendid one to behold
Maybe the contacts are just dirty. Get a can of electrical cleaner (auto parts store) and spray the connections real good. Then put the connector on and take it off a few times and you might be good to go.
Reply With Quote
  #15  
Old 09-30-2008, 09:50 AM
Jsmooth65 Jsmooth65 is offline
Junior User
Thread Starter
 
Join Date: Sep 2008
Posts: 86
Jsmooth65 is starting off with a positive reputation.
OK I will try that too. I fiddled with it some more last night and I couldn't get it to idle correctly, so I tried running the truck with the MAF unplugged and it made almost no difference! When I start the truck it seems to fluctuate from around 500-1500 rpms in about a 1 second surge pulse. I left it running for awhile and the pulsing never quit. I didn't dare try backing out of the garage or anything yet.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
01 4.2L Water pump help ZenLobo 1997 - 2003 F150 1 02-14-2017 11:12 AM
WTB 460 P/S Pulley 2 groove v belt style AlbraiNYa WTB - Parts & other 4 12-16-2016 07:10 PM
Need suggestions please, truck will barely run- UPDATE, FOUND PROBLEM 45FMJoe 1973 - 1979 F-100 & Larger F-Series Trucks 24 11-04-2016 03:46 PM
A true CAI for the 01+ 2.3s Lone_Ranger01 Ranger & B-Series 5 12-27-2015 04:35 PM
A/C problem Fixed on 5.4L in 20 Steps. runstang22 2004 - 2008 F150 2 08-08-2013 07:29 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1961, 36, air, dies, disconnected, flow, ford, gas, give, happened, js, lincoln, mass, navigator, starts, truck

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

Forum Jump


All times are GMT -5. The time now is 05:11 AM.