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Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26260
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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2000 Ram 1500, backfiring in exhaust and losing power after

Customer Question

2000 Ram 1500, backfiring in exhaust and losing power after cooling off for 15 - 20 min.
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: I'm the passenger and it feels like it's backfiring right beneath me. About 6 months. We don't drive it more than once or twice a week, tho.
JA: Are you fixing your MINI yourself? What have you tried so far?
Customer: throttle position sensor, MAP sensor, intake air temperature sensor, water temperature sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 9 months ago.
Category: Dodge
Expert:  david craig replied 9 months ago.

Hi Im David, thanks for visiting the site. first off what engine are we dealing with and is the check engine light on? and if so what are thee codes?

Customer: replied 9 months ago.
no check engine light. 5.9
Expert:  david craig replied 9 months ago.

ok thanks

Expert:  david craig replied 9 months ago.

Backfiring thru the intake means a spark plug is firing at the wrong time. Either the ignition cables are not routed correctly or maybe the cables are connected to the wrong spark plug. On a 5.9, it is easy to mix up 6-8 or 5-7. I would verify the ignition cables are installed correctly.

Expert:  david craig replied 9 months ago.

checking in to see how its going

Customer: replied 9 months ago.
starting over...backfiring thru exhaust. When we start from cold, engine works fine... problem arises when it sits for 15 to 20 minutes, and we re-start. then it backfires, sputters and won't go over 40 miles an hour for two to five minutes; then runs fine again.
Expert:  david craig replied 8 months ago.

do you have a scan tool that reads live data?

Customer: replied 8 months ago.
I believe so... actron CP9180?
Expert:  david craig replied 8 months ago.

ok, you're going to have to hook up the scanner and drive the vehice til it starts acting up and then record the event or freeze frame the event so we can see what all the parameters are at when the problem occurs

Customer: replied 8 months ago.
before we do this, let me say this: when this happens, it acts like it's flooding (or not getting enough gas), we press down on the accelerator and it chokes off, let up and press down again, it starts to respond, then chokes off again.
Expert:  david craig replied 8 months ago.

im going to opt and out see if another tech has any thoughts on this. intermittent issues are difficult to diagnose over the internet for sure. good luck

Expert:  Amedee replied 8 months ago.

Hello and welcome!

Different Expert here.

Have you checked fuel pressure? You might just have a faulty fuel pump causing this problem intermittantly when warm.

Customer: replied 8 months ago.
no. going to do that now. at idle? or under some load?
Expert:  Amedee replied 8 months ago.

The problem is when the engine is warm under a load right? So you will need to check it WHEN this condition occurs under a load when accelerating. I have the fuel pressure is low, possibly due to a weak fuel pump.

Customer: replied 8 months ago.
do you have suggestions on how to check the fuel pressure while driving down the road? the hose we have isn't long enough to reach from the engine compartment into the cab.
Expert:  Amedee replied 8 months ago.

YES, I do.. one minute while I post that information

Expert:  Amedee replied 8 months ago.

First, you most likley can do this (check fuel pressure) and get it to act up doing a brake stand under a load. This way you dont have to drive the vehicle. You can have someone inside the vehicle doing a brake stand while you are standing next to the vehicle watching the fuel pressure gauge readings while it is hooked up to the fuel rail with the hood open.

Expert:  Amedee replied 8 months ago.

Second, you can purchase an electronic or digital fuel pressure gauge and hook it up to the fuel rail and has a long "wire" that goes into the vehicle on your hand held digitial display so you can take a fuel pressure reading while driving down the road.

Customer: replied 8 months ago.
just checked at idle: 46 lbs.Turned off; went under truck to check to see how hard it would be to remove fuel tank to change fuel pump. heard glug-glug gurgling in tank, pressure was dropping rapidly.
Expert:  Amedee replied 8 months ago.

You got it! I suspect we nailed it. Replace the fuel pump and you will be good to go!

Expert:  Amedee replied 8 months ago.

I am glad I can help!

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Customer: replied 8 months ago.
you're sure it's the pump and not the regulator? is there a check valve? our manual...Haynes Repair manual for 2000 full-sized pick ups ...doesn't show a check valve unless it's in the pump itself
Expert:  Amedee replied 8 months ago.

YES, thats correct. The fuel pump regulator is in the fuel pump assembly.

Expert:  Amedee replied 8 months ago.

Hello! It'sCustomerfrom just answer.

I am just checking in to see if you need any further assistance?

Let me know!