This is beginning to piss me off.
Pushed the sploder back into the garage just a few minutes ago, so it can warm up enough to drop the tank and change the fuel pump tomorrow. If that doesn’t fix this, the next thing is the ECM. If not that, I’m out of farging ideas.
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One question, Do you have fuel pressure to the rails? I don’t know about henrys products, but GM’s have a schrader valve in the fuel rail for such a test.
If you have pressure, you have a good pump. 25psi usually for fuelies.
The other thing to check is for in line fuel filters.
I didn’t mention this earlier as you seem to know what you are doing.
Good luck
Yeah, it’s got the small schrader valve, when you fire it, it pumps to about 35. Cranking makes it drop down as far as 10, and I wonder if that means the pump is weak. I thought i had a lack of spark, but discovered my timing light was bad- tonight, in the dark, I was able to hook up a spark plug and confirm spark, so that’s OK. I SMELL gas, and that makes me wonder if the ECM is bad.
Smells like the ecm to me, but hell, what do I know?
Think it will haul six large bags of coal? I can get you a 20-hp steam donkey engine….
You will have a total of three sensors providing data to the ECM. One is the TPS or Throttle Position switch, one is an O2 sensor and the third is called a MAP sensor. They all work together to tell the ECM how much fuel to deliver.
I would be suspicious about the Fuel Pump as I’ve never seen one drop during cranking, (its electric) but if you have gas it is probably not the total cause. I would check the TPS or the O2. The TPS could be signaling open which would explain the gas smell. If you are smelling gas the injectors are opening, probably too wide.
Four 02 sensors. All within spec. MAP sensor and MAF sensor working peroperly. Camshaft position sensor replaced. Crankshaft position sensor- well, you have to disassemble a lot of shit toeven SEE it, so I’m hoping that’s not it. And t affects spark, and not fuel, anyway. And I apparently have spartk.
The pulsation- I believe- is becuase of the pump providing insufficient flow, and therefore when the injectors open the pressure drops. (theory) So: Pump next, thenm ECM.
I forgot about the TPS reports. Did you get the memo? Mmm…yeah…
But, but, but . . . .
Pleeze don’t take my red stapler.
I assume that you’re following the trouble-shooting procedure in your shop manual? It takes a huge degree of luck to find problems in modern cars w/o “the book”.
Yes, all by the book. SO far the book is solving nothing.
Second the thought on a weak fuel pump, or perhaps corroded connections causing a voltage drop at the pump. The pressure shouldn’t be dropping like that during cranking.
Random thought: plugged fuel filter, either external or internal to the tank. Still gotta pull the tank and pump if the latter, of course.
FWIW, these Mopars I like to play with are spec’d at 46-52 psi or thereabouts, I would think your FoMoCo product would also be in that ballpark. The turbo’d engines are even higher, to compensate for the positive pressure under boost.