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ACCEL DFI Knowledgebase Question:

I replaced the stock injectors with new Accel 150832 fuel injectors. I modified the PCM injector constant from 24.97lb to 32lb to reflect the new Accel injectors. With the injector constant changed for the new injectors my car has a hard time starting, this is not normal for my vehicle. My car has always started within one complete revolution of the engine, I could bump the starter and the car would start. Now with the 32lb injectors the car starts like crap. I have to crank the starter for a minimum of about 6 - 8 seconds before the car will start and then it takes another 5 - 6 seconds before it begins to idle. It acts like it is not getting enough prime - if I put the car to 1200 RPM and turn off the ignition while holding the throttle (priming the engine in essence) my car will start quicker the next time with the 32lb injector setting, but still requires 4 - 5 seconds before it will start. I have checked the fuel pressure, it is 44lbs at idle with the vacuum line disconnected and at 36lbs at idle with the vacuum line connected, these are definately within tolerances. I have had several replies on message boards stating that this is a common problem with Accel injectors and I should get SVO's instead. After spending $300 on these new injectors I would expect the my car to start normally and not have the issues with starting. Thoughts? Fix? Refund? I use TunerCat to modify the PCM. Other than the transmission shift points the PCM is stock except of course for the 32lb injector constant. Jonn A Betzer

Reply from Rep:

If you went from 24 to 32#/hr injectors, you are adding quite a bit more fuel to the motor while starting and running. You will have to modify your starting tables of fueling if you expect the engine to start properly, your adding 30% more fuel across the board. Its so rich when starting that once it starts it takes a few to burn the excess fuel out of the system. It may be a common problem to people you are talking to about it if they are not familiar with the consequences of adding a larger injector without changing the fueling strategies.


Related Product Info:

32lb - 8-pak


  • Provides precise control of fuel delivery & atomization for increased power, improved throttle response, & better fuel economy
  • All new units; not modified stock units or remanufactured from used cores
  • New low-mass disc design ensures accurate metering control even at ultra-low & high duty cycles
Sold in 8-pack.
Model Number:  150832


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Vehicle/Engine Specs:

Make:  Pontiac
Model:  Formula
Year:  1994
Engine Type:  LT1
Transmission:  A4
Modifications:  Speed Density, MAF removed. Flowmaster Cat back exhaust.
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