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post #1 of 6 (permalink) Old 09-25-05, 06:12 AM Thread Starter
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Knocking or pinging under accelaration with lower grade fuel

Hey there everyone, I have a 99 for ranger 4cylinder and everytime I put low grade in it, it spark knocks. If I put the high grade then it does it very little but still does. I am thinkin it is something to do with the carbon build up in the valves because that is where the sound is comming from. Anyway has anyone else had this problem? I though timing issue to, but there is no dizzy on this one, just the coil packs. Can someone help?

Aaron

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post #2 of 6 (permalink) Old 10-11-05, 07:02 PM
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Re: Knocking or pinging under accelaration with lower grade fuel

as to be expected low grades of gas will cause shitty runing which is horrible for an engine always fill with the best u can afford to unles otherise specified
theres a product called sea foam, u can pour it down the intake manafold to help remove carbon buildup espicaly on the valves
however vaves shouldent knock it might be ur lifters, crank or sumthing like that but i duno bout the valves
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post #3 of 6 (permalink) Old 01-06-06, 06:27 AM
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Re: Knocking or pinging under accelaration with lower grade fuel

I have a 2000 Ford RangerXLT 2.5L I4 5 Speed M
and I too have recently noticed the same pinging sound usually when in 4th & 5th gear, under acceleration, I went to mid grade and still have slight pinging although not as bad as when on the low grade crap
and I really don't want to go through that whole spark plug changing incident I had 3 months ago, I was thinking it maybe a slight ECU problem with the timing, might see about disconnecting the battery for 20 mins or so and allow the ECU to re-learn it's values, anyone else with any ideas please help
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post #4 of 6 (permalink) Old 01-18-06, 09:00 AM
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cool Re: Knocking or pinging under accelaration with lower grade fuel

Depends on the blend of gas you get where you live. It varies from place to place and time of year thanks to the EPA. Here in PA my vehicles run like crap on the summer blend we get and I have to use at least 89 octane. From October to May they're fine on 87.

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post #5 of 6 (permalink) Old 02-21-06, 01:39 PM
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Re: Knocking or pinging under accelaration with lower grade fuel

Well it finally threw an engine code, (401) insufficent EGR flow or something like that.
Changed out the Vaccum sensor (DEFP whatever it is called), small Aluminum casting with 2 hoses and the multiplug connection, seems a little better, pings ever so slightly,
now I have an Exhaust Manifold problem. either the manifold gasket is shot, the Manifold has a crack, or a hole, or the Dougnut between the manifold and downpipe is shot.
F***ing typical, change one component and something else goes bad.
only had the truck for 8 months now has 91,000 miles on it.
I Will never buy another American Ford, I should have learn't my lesson with the UK vehicles, such as the two Escort XR3I's, Sierra Sapphire and Escort RS Turbo I had.

Dealer quoted me $408 for Exhaust manifold, being as Discount Auto doesn't have that part of the system, typical.
will have to remove the manifold on Friday, this week, to see if there are any cracks etc. already got a new gasket and Doughnut ready, anyone have any hints or tips on removal of Manifold, knowing how bad the nuts seize up.
Also does anyone know what the torque settings are for the manifold nuts and the downpipe bolts being as the crappy Haynes manual doesn't have them listed, don't want to bust any bolts. etc
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post #6 of 6 (permalink) Old 02-23-06, 01:41 PM
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Re: Knocking or pinging under accelaration with lower grade fuel

Thanks for the help guys
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