Engine runs good till I full throttle get then starts this fittings butter and backfire

Asked by travis Jan 26, 2019 at 07:57 PM about the 2001 Dodge Dakota SLT Quad Cab 4WD

Question type: Maintenance & Repair

Hi I have put new fuel pump, new ecm ,new timing chain
set, new plugs and packs, new cam & crank sensors, and
TPS sensor. And it's still spitting and sputtering if I full
throttle it but if I just slowly push the pedal down it will run
fine. When it's in gear it will make it up to about 25 to 30
mph then it will spit and sputtering and I can pump the gas
then it stop for a few till it gets up to higher rpm no codes
are being are coming up. I've taken it to 3 different garages.
One garage said plugged Cat converters so I unhooked
from manifolds no change. Then 2 one said timing chain so
replaced still no change. The 3 one said didn't no what's
wrong and gave it back with no charge

3 Answers
2,570

Sirkut_Interrupted answered 5 years ago

When it backfires is it out the exhaust or up thru the intake? What i would do is put a put a fuel pressure gauge on the rail and with the truck idling note pressure, rev it up really quick and it shouldnt drop at all... if its popping back thru the intake this could b from a low fuel pressure problem( restricted injectors, bad map sensor, bad pump power/ground)

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travis answered 5 years ago

I'll do that tomorrow the backfire is through the intake I checked the power and the ground on the pump when I put a new one in the reason I changed it was I put pressure gauge on it before I changed it and idling it was bouncing around and if I full throttled it would drop almost to 10 psi so I changed the pump out no change and I've hooked my ohms meter to all the injectors none was way out enough to make me think one was bad

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Sirkut_Interrupted answered 5 years ago

Well you can have restricted injectors from dirt or rust and electronically ohm out to spec.. but its just something to to always consider when u can think of anything else is maybe running injector cleaner through it.

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