2.9 valve knock

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Jan 25, 2003 | 05:56 PM

Jackomatic

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2.9 valve knock

I have a 90' 2.9 ranger standard 4speed with o-drive. I got the truck from my father inlaw 2 years ago. It had 69000 miles on it. It knocked under the slightest load. I gave it complete tune -up using Bosch parts, still had problem...put 180 stat in and changed o2sen...to no avial.....have 86000 on truck now and have put more money in to it to try and correct problem then was put into truck the first 10 years of its life.......the truck is in real good shape and handles well I just can't figure out what to do to stop it from knocking. I run 89 fuel in it , have dumped every type of cleaner in it except drano.....have tried all kinds of plugs from bosch +4 TO OE AUTOLITES.....IS THERE A KNOCK SENSOR ON THIS ENGINE? IF so where and will this solve the problem ..........Thanks for any help from anyone out there

Last edited by Jackomatic; Jan 25, 2003 at 06:41 PM.

Jan 26, 2003 | 12:32 AM

tomw

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From: suburban atlanta

2.9 valve knock

If you are talking about pinging, then give the water treatment a chance. Take a windex type sprayer, and fill it with H20. Start the truck with the air tube off the throttle body. Accelerate the engine to a Fast idle, and spritz water into the intake past the throttle body. The water will turn to steam and in some cases blow off the carbon that has accumulated on the top of the pistons... Old trick from an old man.. Well, not that old..
Can't hurt, unless you hydrolock the pistons, but you'd have to have the strongest Windex finger in the world to do that..
Check the conditions for ping... 5th gear going up a hill? On the flats? Does it go away if you goose the gas pedal a little? Does the EGR work?

whatever. tom

Jan 26, 2003 | 08:25 AM

Jackomatic

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2.9 valve knock

Quote:

Originally posted by tomw
If you are talking about pinging, then give the water treatment a chance. Take a windex type sprayer, and fill it with H20. Start the truck with the air tube off the throttle body. Accelerate the engine to a Fast idle, and spritz water into the intake past the throttle body. The water will turn to steam and in some cases blow off the carbon that has accumulated on the top of the pistons... Old trick from an old man.. Well, not that old..
Can't hurt, unless you hydrolock the pistons, but you'd have to have the strongest Windex finger in the world to do that..
Check the conditions for ping... 5th gear going up a hill? On the flats? Does it go away if you goose the gas pedal a little? Does the EGR work?

whatever. tom

Tom, Thanks for the idea........I will try this when temp gets above freezing. Live in up state N.Y...as far as when this occures, after it hits opperating temp under any load condition......on highway in 5th on level ground, going up an incline in 3rd......Don't notice it in 1st or 2nd or when cold .....replaced temp sensor thinking this may be culpret.......no change.......this is a 90 2.9 there is no egr.....this is done some other way.........thanks agin for the advice......J-matic.......

Jan 27, 2003 | 10:37 AM

Ken00

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From: South Jersey

2.9 valve knock

I'm sure you did but did you check the timing? No knock or EGR on a 90 2.9.

Jan 27, 2003 | 11:48 AM

Jackomatic

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2.9 valve knock

Ken00, Thanks for the reply........Yes I have checked timing and its dead on.........in fact becauce system is controled by eec IV computer I thought maybe it was getting a incorrect reading from control modual on distrbutor.......I replaced not only the modual but the distributor also ........just more money thrown away.......is it possable to advance timing on eecIV units or will the computer just correct this.......also will a after market chip correct this?????????......I tried to get a performence chip but can't find one for a standard!!!!!!!!!........whats up with that???????? also how does one insert photo??????would like to show off truck. - J-matic......

Jan 27, 2003 | 01:04 PM

Ken00

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From: South Jersey

2.9 valve knock

If you advance the base timing the rest will follow.

I never heard of anyone having a problem with getting a chip for a 2.9 but I have never bought one, have you checked at our online store.

At the bottom of the page in the box called "forum rules" go to the vB code link and then put the proper code in your signature. Let me know if you need more help with this.

Have you run the KOEO & KOER test to see if any codes show up, you could also test the ECT, ACT and MAP, if it's a California truck it might be a MAF instead of a MAP.

Jan 28, 2003 | 03:52 PM

ianjay42

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From: Toronto Canada

2.9 valve knock

Hi there. I have a 1990 2.9 with manual transmission also. When you say that you replaced the temperature sensor, was it the one under the throttle body that is on about a 45 degree angle? The little temperature sensor on the driver's side cylinder head at the front sends a signal to the dash gauge but this one, which is closer to the thermostat, talks to the engine computer. I have had trouble with this one. It may have a different name, but definitely is reading coolant temperature. When it gets messed up, it sends confusing signals to the engine control computer and driveability suffers (terribly) especially if the engine is warmed up. The ping is very likely carbon build up though. I get a little rattle if I'm in the wrong gear around town. My truck has 329,000 kms and has just passed the Ontario emissions test with the original catalytic converter. These are terrific engines and it may be worth taking it to a tune-up specialist who can look inside. What usually kills the 2.9 is a dirty oil pickup screen. Good luck.