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post #1 of 12 (permalink) Old 02-04-2008, 06:04 PM Thread Starter
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Help! Oil smells like Gas

I just got the 97 Kenny Brown Tbird back and am starting to try and get it running good again. I know it was giving the previous owner some problems recently (bad gas mileage, stumble at part throttle, poor idle), but there has not been any smoke from the pipes or oil consumption that would indicate worn rings or compression problems.

Yesterday she ran ok, washed the engine bay and parked it for the night. Today no start. It cranks over and over and never fires. Checking the oil it is pretty thin and smells very strongly of Gasoline. Anyone know why or how gas would get into the oil?

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post #2 of 12 (permalink) Old 02-04-2008, 06:30 PM
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Intake Gaskets i'd say.

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post #3 of 12 (permalink) Old 02-04-2008, 06:52 PM
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If the fuel injectors are firing but there is no spark, then there will just be air and fuel dumping into and out of the cylinders. Some of that fuel will get into the oil, which is probably why it smells like gas now. It needs to be changed ASAP.

For a no spark condition, check the crank position sensor. The connector and wires seem to be problematic on these cars.

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post #4 of 12 (permalink) Old 02-04-2008, 07:36 PM Thread Starter
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Ok just finished the compression check and it looks decent.
1-150 5-155
2-150 6-150
3-130 7-135
4-125 8-155

All but 3 of the plugs were soaked with gas. I'm not sure if that's due to leaky injectors or possibly the fact that I was cranking on it, hoping for a start a few minutes prior. I'm gonna go ahead and give her a full tune up & oil change and see what happens next....

Thanks for you guys patience with me. I know 3.8 Supercoupe's inside & out, but the 4.6 is new territory for me.

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post #5 of 12 (permalink) Old 02-04-2008, 07:42 PM Thread Starter
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Oh I forgot to mention. This car has the plastic intake on it still. I know the original owner said it cracked and he had it replaced under warranty. Do you guys think the Vortech might have blown that out again?

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post #6 of 12 (permalink) Old 02-04-2008, 07:52 PM
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I couldnt tell you as i own a 3.8 but i wouldnt say it not possible.

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post #7 of 12 (permalink) Old 02-05-2008, 05:28 AM
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I would go with the plan to change the oil and figure out why it is not firing. Don't think the intake or gaskets is the problem. A blown intake usually just dumps out coolant. If the gasket is bad you should be getting in extra air or possibly coolant leaking outside or in the combustion chamber.

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post #8 of 12 (permalink) Old 02-05-2008, 06:43 AM
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It could be something as simple as a bad fuel pressure regulator. No fire and fuel in the oil can also be an indication of a severely flooded engine.

Here's what I would do:
1. Change the oil (as previously mentioned)
2. Replace the spark plugs and confirm spark with one of them before installing it (remove the fuel pump relay/fuse first so you don't foul out the new ones.
3. Install the fuel pump relay/fuse and then hook up a fuel pressure gauge to the schrader valve on the fuel rail and confirm that you have the correct pressure AND that the pressure holds while the pump is off (to verify you don't have an injector hanging open)

I’m going to bet on a bad fuel pressure regulator. But that’s just a WAG.

Just my .02 and good luck.

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post #9 of 12 (permalink) Old 02-05-2008, 07:54 AM Thread Starter
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Thanks for the input guys. I drained the oil last night and it wasn't nearly as bad as it was on the dipstick. So I'm picking up plugs, wires, oil, filter, pcv valve, O2's, and a fuel filter today. Slap all that on and then I'll check the fuel pressure and spark as mentioned above, and cross my fingers

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post #10 of 12 (permalink) Old 02-05-2008, 01:34 PM
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Good Luck!

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post #11 of 12 (permalink) Old 02-06-2008, 06:16 PM
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The intake manifold or gaskets won't cause excess fuel.

Your issue is fuel without spark, or so much fuel it's "washing" the cylinder walls, and being scraped into the pan by the oil 2nd ring. If either go on too long you'll have excess cylinder wear.

I'd watch cylinders 3, 4 and 7. those compression numbers are kinda low. 125 vs 155 is a solid 20% lower.




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post #12 of 12 (permalink) Old 02-06-2008, 08:55 PM Thread Starter
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Well I got the oil changed, plugs, wires, O2's, and PCV, changed out today. I'm doing a fuel pressure check this weekend to see if I have an injector or FPR problem. The injectors are 30# and only have about 10k miles on them, so I'm doubtful they are the problem. As long as that's all ok, I'll hook up the datalogger and Wideband and see what the tune is doing. It's got an SCT chip in it so it shouldn't be tough to get worked out.

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