So I am having some pretty bad knock under boost. Sounds like a bad rattle or tapping under WOT and when the turbo seems to be spooling.
I have checked my timing, vacuum lines and fuel air mixture; all is well. Note that F/A mixture test was only done at idle and high speed. I do not have an O2 Sensor.
The engine is running really well under all other conditions, including high rpm with no boost.
Here are what I think could be possible culprits:
The intake manifold gets hot as hell.
I am also having hot start problems.
I am also wondering if the Audi 5000 WUR is not operating correctly and not delivering extra fuel under boost and start ups.
How hot should my intake manifold actually be getting?
Is there anyway to check the operation of the WUR?
If the knock is fuel related should I add a extra injector? How should I do that?
Thanks for the help!
Here are some quick specs on the engine:
1.8l block, 2l crank, stock 1.8l rods, "squished" pistons, 2 over bore, stock compression (sorry I don't have the measurements on me), hydraulic lifters
BAE Rajay turbo good for 5-7psi or boost
Volvo fuel distributor, Audi 5000 WUR
Volvo Oil cooler, Euro GTI Oil filter Manifold, Porche 944 Thermostat.
Stock everything else
Here is a picture, because post kind of suck without at least one: