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Old 02-23-2009, 01:32 PM   #1 (permalink)
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My spark plugs are saturated with gas...Anybody?

O.K.,
Here's the deal,
Over the past few months I've been trying to figure this thing out.
After running my car a few times it eventually doesn't want to start,it just turns over.
After I replace the plugs it starts right up.
When I pull the plugs they (all of them) are completely saturated with fuel,I believe this is why I run into my starting problem.
I have changed my fuel pressure regulator to a factory OEM one.
My engine is a 302 with Trick flow aluminum heads and Trick flow EFI.
I was told I have have 30lb injectors.
It also has a pretty lumpy cam.
I don't know the exact specs. of the engine as I did not build it myself ,it came out of the donor.
Can anybody recommend or advise what could be causing it to run so rich ?, I'm getting tired of changing the plugs....
Thanks,
Eric
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Old 02-23-2009, 02:12 PM   #2 (permalink)
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I would start by checking and adjusting the basic engine tune.
Timeing,tps voltage. Ohm the plug wires to be sure thier good.
Also put a gauge on the fuel rail to verify fp. Just useing a new regulator does'nt guarentee it's correct. Should have 39psi at idle vacum disconnected
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Old 02-23-2009, 03:43 PM   #3 (permalink)
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Do you have a MAF calibrated for the 30# injectors?

If the engine is not getting warm and going into Closed Loop and then keeping power to the EEC, you will struggle using the 30's. The base tune is going to be pretty rich until it learns to cut back the fuel. The EEC will revert to the base tune anytime it loses power.
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Old 02-23-2009, 03:57 PM   #4 (permalink)
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Are you running a maf? Is it calibrated for 30lb in?
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Old 02-23-2009, 06:09 PM   #5 (permalink)
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I may have to bring it to a shop to get the MAF calibrated,and I will add an adj. FPR It originally had one but it was leaking so I just put a factory one in.
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Old 02-23-2009, 11:49 PM   #6 (permalink)
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yeah maf , has to be calibrated to the injectors . Also check for codes and vacuum leaks EFI is backward lean is rich . 1 other possibility is the map sensor , if its hosed it'll flood the engine . Can be tested with a voltmeter and a hand held vacuum pump. Bob
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Old 02-24-2009, 01:46 AM   #7 (permalink)
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Just for grins, let's get to Narve's point. What temp thermostat are you running?

Yeah, it shouldn't make a difference. Even in closed loop where it's depending on its internal program and not yet using the HEGOs, it shouldn't be so rich it's fouling the plugs.

But still, what thermostat? And where's your temp sensor? Not your gauge sender. The temp sensor that goes to the computer.


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Old 02-24-2009, 03:29 PM   #8 (permalink)
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When the HEGOs are inactive the EEC is in Open Loop (no feedback).

During crank the EEC is using 19 lb settings (no MAF input), so it blows in too much fuel at a 30/19 ratio. If the engine doesn't light off pretty quickly it starts to get flooded. Most guys who have run 42's without a chip have a routine of crank, if it doesn't start, stop, floor it (shut down the injectors) and try again.

Don's right the MAF will correct for the injectors (typing quick at work). However, seems most calibrated MAFs are weakest at idle (maybe less resolution at idle). The calibrated MAFs need some learning. It will never learn different crank settings.

If your MAF is not calibrated, it will absolutely be too rich.

Last edited by narve00; 02-24-2009 at 03:36 PM..
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