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Old 04 Apr 2020, 03:35 PM   #1 (permalink)
alunian
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Join Date: Aug 2010
Posts: 789
PAS (power steering) causing engine knock

Car is a UK Turbo 2000, mods are :
MAC 3 port boost solenoid
TD05 Turbo
Samco Intercooler hoses
Remap 303bhp by Bob Rawle

Just wanting to know if anyone has had this issue with power steering?

This is a weird issue, I've heard of exhaust shields rattling causing engine knock which makes sense, but I have just discovered that something relating to the power steering is causing engine knock.


When I first got the car the metal cover that goes from the power steering reservoir to the alternator wasn't bolted to the reservoir. It had no issues even when it was remapped and it didn't cause any problems with tuning as Bob Rawle said he was able to add a lot of timing to the map.

The only problem I found was that the PAS belt would squeal in freezing cold weather, turned out that the belt was 15mm longer than it should and it was brand new. When I had the time belt done I also got the correct size PAS belt supplied and fitted by Alyn he stated it was the same brand and product code as what was already fitted he showed me before fitting it.

This is when the issue started. Again the cover for the belt wasn't bolted down as the bolt was missing. However it was hitting the bonnet when corning and hard acceleration as it had worked itself loose (I could hear and feel it through the steering wheel) this was showing in the logs as a very small amount of engine knock of -1.5 degrees of timing for less than a second at 4300rpm and then it would add the timing back. I then bolted it down and ended up with engine knock of -8 degrees of timing for just under 1 second again at 4300rpm and I felt it, it felt like no boost and then it would add the timing and the car would take off again.

I have now removed the cover and cable tied the throttle cable to the PAS reservoir, I still get engine knock of -8 degrees of timing but its only for approximately 271ms each time on the data log and I can barely feel it.




I have noticed that my exhaust shields near the radiator is broken loose so Im going to try and remove it to see if that makes a difference.
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