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I have a 1996 Dodge 3500 Van with 200,000+ Have replaced ...

Sent to Car Experts July 23 2006 at 7:30 AM
   

I have a 1996 Dodge 3500 Van with 200,000+   Have replaced computer, ign coil, wires plugs, checked wiring.    Wants to back fire back through carb espeailly under load.   No power,,   has fuel.. Any Ideas????????

 

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1996 Dodge b3500 5.9

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Answer
July 23 2006 at 9:06 AM (1 hour and 36 minutes and 37 seconds later)
         
REPLIEDCheck Mark
If no check engine light is on check the cat for being plugged. If you remove front O2 sensor and put in a pressure gauge should not exceed 2 pounds if so replace cat if no gauge try running with o2 out for a short time is there more power. If this has been helpful an accept would be appreciated Thank you Bill
Bill -- mechanic -- 100% Positive Feedback on 98 Car Accepts
mechanic since 1976
Reply
July 23 2006 at 11:15 AM (2 hours and 8 minutes and 37 seconds later)
         
Reply to Bill's Post: check engine light on code 43   removed O2 sensor same problem

Edited by Customer (name blocked for privacy) on July 23 2006 at 11:35 AM
Customer (name blocked for privacy)
Answer
July 23 2006 at 11:38 AM (23 minutes and 14 seconds later)
         
REPLIEDCheck Mark
If the code is actually P0430 then this points to the O2 sensor in bank 2, but this could very well be caused by a faulty catalytic convertor, as has happened in the past.

If it is P0043, then this points to the Heated O2 sensor heater circuit low, bank 1 sensor 3, but I doubt it.

Geordie

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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 217 Car Accepts
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July 23 2006 at 11:46 AM (7 minutes and 53 seconds later)
         
Reply to Geordie's Post: i'm missing something here,,, if the o2 is removed and still backfiring?????????
Customer (name blocked for privacy)
Answer
July 23 2006 at 11:55 AM (8 minutes and 32 seconds later)
         
REPLIEDCheck Mark
Does the van only have one sensor?

Geordie

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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 217 Car Accepts
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July 23 2006 at 11:56 AM (1 minute and 11 seconds later)
         
Reply to Geordie's Post: has two one front and one rear   front removed

Edited by Customer (name blocked for privacy) on July 23 2006 at 11:57 AM
Customer (name blocked for privacy)
Answer
July 24 2006 at 8:18 AM (20 hours and 22 minutes and 29 seconds later)
         
ACCEPTEDCheck Mark
Hi

If I'm not mistaken, the front O2 sensor should switch very quickly from around 100mv to around 800 or 900mv.

The rear one however, should switch more slowly and I don't think it should exceed 200mv.

If the switching of the rear O2 sensor follows the pattern of the front O2 sensor then your CAT could be failing.

Regards

Geordie

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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 217 Car Accepts
22 years of mechanical experience, and I am the mechanic in my own automotive partnership
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July 25 2006 at 2:32 PM (1 day and 6 hours later)
         
Reply to Geordie's Post: geo

Ok the 02 sensor are good   cat is good   if was timing chain it would not go 70 miles an hour and then all of sudden just down power as if no fuel or ign and backfiring through carb.   wiring new ign mod new ign coil new dist cap new
Customer (name blocked for privacy)
Answer
July 26 2006 at 6:25 AM (15 hours and 52 minutes and 48 seconds later)
         
REPLIEDCheck Mark
Hello again!

I have had a delve into fault code 43 and apparently, it is linked to misfiring being detected and I'm going to bow down to the techs superior knowledge on that one, but it is not fuel or iginition specific, so it could be either.

Easy things first, I believe your Dodge is equipped with a MAP sensor.

If you could remove the vaccuum pipe completely from the sensor and inlet and blow it through, then replace it and see if there's any improvemment. The vaccuum pipe over time becomes clogged with fuel etc.

You should be able to blow through the pipe without restriction, even if there is a fuel trap connected to the pipe, there should still be no restriction, taking into consideration of course the pipes bore diameter.

Please ensure that it is removed completely from the sensor because it is a very delicate sensor and it can easily get damaged.

Let me know how you get on and we'll get our heads back together again. I've got more tricks up my sleeve yet!!

Best wishes

Geordie

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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 217 Car Accepts
22 years of mechanical experience, and I am the mechanic in my own automotive partnership
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July 26 2006 at 1:20 PM (6 hours and 55 minutes and 36 seconds later)
         
Reply to Geordie's Post: Geo


Everything in the ing systems seems to check out However I have been racking my brain.. I have noticed that when I have 3/4 tank of gas seems to be ok. when fuel gets low problems begin..   Could it be possible the fuel pump getting warm and not delivering enough fuel creating this condition??? You have been very hepful.
Customer (name blocked for privacy)
Answer
July 27 2006 at 12:09 AM (10 hours and 49 minutes and 2 seconds later)
         
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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 217 Car Accepts
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