Hi,

I hope someone has some insight for this.

I have a 95 dakota 3.9 that has about 250k on it. The other day it just cut off several times after putting it in gear.

Now it won't start at all unless I floor it. Then it cranks but only reaches 1500 rpm, shakes, and backfires with low pops in the mid exhaust.

All compression is 105 or better. I verified TDC (had a new chain last year). Nothing was off. Verified all of my rocker motions. Replaced the coil and the Crankshaft position sensor.

Doing the OBD key switch thing, my check engine light appears to blink once, twice, five, and five before going out. I did not see an error code for this. I tried to reset the PCM but it returned teh same code.

Any help would be appreciated. It will not stay running if I taker my foot off of the gas...even then...it was barely running.

If it was an old stile car I would say my distributor was out 20 degrees....but


Any help or guesses would be greatly appreciated. I can't drive it to a service center.

Thanks

 

Do you have a way to check the fuel pressure?

 

Thanks festerw

I don't have any way to check fuel pressure. I can depressurize my injector manifold, disconnect and put the feed into a clear bortle just to watch the flow maybe.

Do you think that I just don't have enough flow and am causing the shaking and backfiring from having the air mix too high with the throttle wide open?

 

Correct, I'm guessing that the fuel pump is crapping out and you're not getting enough fuel.

It's an expensive proposition just on a hunch though. I don't know if Advance/AutoZone have fuel pressure loaner tools or not.

 

Thanks...



There is a fuel pressure service port on my injector rail. I will get a simple guage and check it tonight.

 

Pressure should be 35-45psi, if you want to do a flow test also it should pump roughly 1 liter/minute.

 

Tested fuel pressure today. settles right at 40 psi. repeated test. repeated results.

Maybe a throttle position sensor gone bad? since when i get it to run i have to have the throttle mechanically opened all the way....and runs like crap at 1500 rpm Max like the fuel injectors think the throttle is barely open and barely deliver gas to a supper air rich mixture? maybe?