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Old 12-08-2013, 12:45 PM   #1
d_man1
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Default Pinging after Uphill...

First off, Hello! Hope your day is going well! I have a problem with my 02 3.0L :(

She just got over 120k on friday and since about 110k and up i have noticed a pinging sound AFTER i open the throttle up OR drive up a hill I did a leak down test and a compression test on all cylinders and they all are in solid shape. replaced the distributor wires, and spark plugs at the 110k mark. I have noticed my truck idles EXTREMELY low, in the 500rpm range. Some times when im reversing and shifting into drive (automatic) the truck fully dies/stalls. This happens about 1/5 times.... I have no check engine light on currently.

Any help is appreciated, and if i could buy you a beer for the help, i would!

thank you
-Don
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Old 12-08-2013, 02:23 PM   #2
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First stop EGR valve

EGR valve should be closed at idle, if it is dirty, so leaking, then engine will idle lower
EGR valve opens when you accelerate or engine is under load(uphill) this prevents pinging by "cooling" the cylinders, if it is dirty and not opening enough then you get pinging, or if EGR tube is restricted.

Could be the EGR sensor or a vacuum leak in the EGR system but that would usually cause CEL to come on.

Running too lean can cause pinging but that is usually caused by a vacuum leak so idle would be higher not lower, and O2 sensor reporting lean would usually turn on CEL

Clean MAF sensor, easy to do and it is the main sensor for fuel air mix

Last edited by RonD; 12-08-2013 at 02:29 PM.
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Old 12-08-2013, 07:48 PM   #3
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Thank you Ron! I will get right on this first thing in the morning! One question, where can I get a head fitting for the torx style screw on the MAF? Its a TORX head with a male pin in the middle as im sure you might know. Ill try the good ole search function. Also how would I check the EGR valve?
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Old 12-08-2013, 09:50 PM   #4
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Google: security bit screwdriver

lots of options, bit sets or screwdriver


In this case you should remove the EGR valve, with or without tube, so you can visually inspect it for clogging.
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Old 12-08-2013, 10:11 PM   #5
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Quote:
Originally Posted by RonD View Post
Google: security bit screwdriver

lots of options, bit sets or screwdriver


In this case you should remove the EGR valve, with or without tube, so you can visually inspect it for clogging.
do you know where the EGR valve is located off hand?
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Old 12-08-2013, 10:17 PM   #6
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Also my oil gauge starts randomly shaking up and down very fast at some points also...
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Old 12-09-2013, 07:44 AM   #7
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The EGR vavle itself is usually near the front of the upper intake manifold on the drivers side. there will be a tube that runs from the drivers side exhaust manifold to the upper intake. The EGR valve will be located on that tube.
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Old 12-09-2013, 09:09 AM   #8
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^^ +1

Ford oil pressure gauges are connected to an oil pressure switch, not a "sender", so either show normal pressure(above 5psi) or no pressure(below 5 psi)

A jumping needle usually means a loose wire on the switch or a bad switch.
Switch is on the engine block usually near the oil filter, it only has 1 wire connected.
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Old 12-14-2013, 01:54 PM   #9
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Thanks guys Still have not checked the EGR valve yet. Going to clean the MAF then check that later today
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