Pinging when engine warm
#1
Pinging when engine warm
My 92 4-runner v6 3.0 runs smooth at start up but it reaches normal running temp there is a pinging noise at 3000 rpm or greater. Changing fuel doesn't seem to change it. Does anyone have any ideas what might be causing the problem?
#4
I would look for something loose on the rotating assembly then. The idler pulley is of particular interest here. Shut the motor down and check for play in everything you can, such as the PS pump pulley, AC compressor pulley, etc.
This doesn't sound like detonation to me since it is happening while sitting there and revving it too (rarely does that happen unless your timing is completely whacked out).
This doesn't sound like detonation to me since it is happening while sitting there and revving it too (rarely does that happen unless your timing is completely whacked out).
#5
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Check fuel injection pressure at the rail. If its low, you are running lean, which will ping. Then the question is, 'why is the pressure low'? Not many things to go wrong here: Fuel pump, regulator, filter.
#6
Contributing Member
Originally Posted by Unhappy99
Check fuel injection pressure at the rail. If its low, you are running lean, which will ping. Then the question is, 'why is the pressure low'? Not many things to go wrong here: Fuel pump, regulator, filter.
I'm very impressed unhappy.... diagnostic skills at its finest. Ever thought about working as a mechanic?
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