Knocking noise
Hi all after scratching my head for a couple of weeks it's time to ask for help.
From idle to 4500rpm on WOT my cars fine as soon as you get to 4500 it knocks or pinks like mad back off the throttle so your on 0 boost and it goes away. Any amount of positive pressure about 4500 will result in the noise. So far I have changed; Fuel pump Injectors Fuel pressure reg ECU Coil packs Plugs Cleaned all neg points on engine/chassis Checked MAF Checked timing (was a full tooth out!!) Boost solenoid Map sensor Checked all vacuum hoses Checked for boost leaks Run the car on actuator pressure only Checked ECU for fault codes none Reset ECU no diff Pressure tested all cylinders all were 130 psi or there abouts Anyone got any ideas???? |
Does it make that sound when you are standing still and just revving it over 4,5k rpm? Any idea where your noise might be coming from? Just wondering, since mine started to do something similar last year. Although it was at 5k rpm and more a metallic grinding noise. Haven't found a solution yet though... :/ "Check the heatshields" seems to be a common answer for this kind of problem.
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Are there any aftermarket mods on the car ie inter cooler, exhaust etc, if so has it been mapped? If it is pinking or det then randomly changing parts imho will have no real bearing over it unless the ecu is seeing the correct data and knows what it needs to do.
Also what year car is it? |
Only parts non standard air filter and exhaust and it's a 94
When I first got it everything was fine it's just devolved this problem |
Try a dose of good octane booster (NF or similar) and see if it reduces the noise. The booster should at least reduce det. to give you an idea if this is the problem.
JohnD |
I will get some ordered tomorrow along with a new clutch!!!!!!???? So much for a brand new one being fitted before I bought the car
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