Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 01-10-2003, 01:11 AM
I MOW ALONE's Avatar
I MOW ALONE I MOW ALONE is online now
LawnSite Bronze Member
 
Join Date: Mar 2002
Location: WARREN MICHIGAN
Posts: 1,691
Need help with Dodge pick-up

Hi,

I need help with my 1993 Dodge D150. It has a 5.2 litre, its MPI. The motor only has 25,000 miles since rebuild. The problem I am having is I'm getting back-firing through the exhaust. I've replaced the fuel filter, cap, rotor, pick-up coil, and the coil, plugs, wires. I also have replaced the crank sensor because the truck kept dying and then wouldn't start, traced that back to the crank sensor, replaced it solved that problem, but still have the back-fire. I checked fuel pressure it should be 35 - 45 psi, I'm getting 30 which I know is a little bit low but when I pull the vacuum line on the fuel pressure regualtor, I'm getting 40 psi. Still has the back-fire. So I feel that it is not a fuel pressure problem. The truck does have a cam sensor, but I am not sure if that could be my problem or not. Any help would be greatly appreciated.

Thanks,
Dave
Reply With Quote
  #2  
Old 01-10-2003, 11:31 AM
E-man E-man is offline
LawnSite Member
 
Join Date: Jan 2001
Location: PA
Posts: 136
Have you checked or replaced the EGR
Also if it has an air pump the problem could be in there. I had a ford that had the valve or diafram (cant remember what is was) in the air pump go bad and it back fired all the time.
Reply With Quote
  #3  
Old 01-10-2003, 11:32 AM
Bob Minney's Avatar
Bob Minney Bob Minney is offline
LawnSite Bronze Member
 
Join Date: Jan 2002
Location: The Hottest driest city next to Hades - Denver Colorado
Posts: 1,094
My first thought was timming but that not even listed in the trouble shooting guide.

Heres a copy of the page from my dodge book.
Attached Images
 
__________________
If you want people to notice your faults, start giving advice.
Reply With Quote
  #4  
Old 01-10-2003, 04:05 PM
Barkleymut Barkleymut is offline
LawnSite Bronze Member
 
Join Date: Jan 2000
Location: Richmond, Virginia
Posts: 1,117
A new PCV may do the trick.
Reply With Quote
  #5  
Old 01-11-2003, 01:42 AM
I MOW ALONE's Avatar
I MOW ALONE I MOW ALONE is online now
LawnSite Bronze Member
 
Join Date: Mar 2002
Location: WARREN MICHIGAN
Posts: 1,691
thanks for the responses they are all good possibillitys how would i check the air pump and the egr what should i look for and i will replace pcv see what happens
thanks
dave
Reply With Quote
  #6  
Old 01-11-2003, 10:33 AM
E-man E-man is offline
LawnSite Member
 
Join Date: Jan 2001
Location: PA
Posts: 136
To check the air pump take off the two hoses that go into it , drive the truck and if it dont baqckfire thats probly the problem.As for the egr the best way without some kind of emmisions test is to try a new one.You can also check the pcv by taking it out and shake it, if it rattles its fine but if it dont then its clogged.
I hope this helps a little ..good luck
Reply With Quote
  #7  
Old 01-11-2003, 07:58 PM
nokomower nokomower is offline
LawnSite Member
 
Join Date: Jul 2002
Location: Nokomis, Fl
Posts: 6
Hi Dave

I have been a Dodge Auto
tech for 15 years and from what I gather your backfire is due to your distributor housing that holds the pick up coil need to be set in phase with the crankshaft to provide the proper timing from the computer to fire the plugs and injectors. I would advise taking it back to whoever rebuilt the motor to check the distributor sync. Also, there was a recall on distributor drive gears prematurely wearing out if there is no excessive play on the distributor drive shaft to cam then more than likely you are ok there! BOTTOM LINE IS the shop that did the rebuild should stand behind their work and correct the problem, or point you in the right direction.
Good Luck
Chris
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 06:39 AM.

Page generated in 0.09209 seconds with 10 queries