Engine backfiring

1997 DODGE CARAVAN

213,000 MILES • 6 CYL • FWD • AUTOMATIC

JUSTTHETIP

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I have changed the crank timing sensor, but the problem still remains, i have tried adjusting the sensor many, many times, but no better results, it seems to happen when encountering a slight grade while speeding up or when calling for more speed to pass, it seems to be worse when engine is hot, on hot days and while a/c is on
I recently replaced the fuel pump, and have checked for vacuum leaks and replaced bad sections, have changed air filter, pvc etc, also had the tranny shift module changed
Any advice will be helpful
Thank you in advance

Jul 24, 2009 at 10:47 PM

KASEKENNY

CAR REPAIR CONTRIBUTOR
18,907 POSTS

There are a number of things that can cause a backfire so let's start with this guide:

https://youtu.be/HiI_eeFg-2A

Once we get through this guide, we are going to have to check the timing and the timing chain to make sure it has not stretched.

The fact that you have better operation going uphill points to a load related issue which can be timing.

So please see the info attached on how to check this.

If the timing chain is stretched or not timed correctly then we need to replace the chain.

I attached the info on this as well.

Let us know what you find with this, and we can go from there.

Thanks

Images (Click to enlarge)

Jan 28, 2022 at 2:25 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.