Hello,
Got a problem with my engine; I'm all out of ideas...
I run a B212 + B204 head, turbocharged. At .2-.3 bar, the engine pings; however, at max boost (.8 bar) it's fine. The harder I hit the gas, the worse the pinging is (really bad!). If I am very gentle with the gas and don't build any boost until after about 4000 RPMs, I don't get pinging. So, the pinging is only with a heavy foot, starting at lower revs, and really bad if I slam the gas.
Some details:
I run highest octane gasoline available.
Timing is 1986 EZK (Hall sensor in dist) AND a Turbo distributor that I "fixed" so it retards but does not advance under vacuum; Base timing is at 15* BTDC. I installed a Turbo ignition control module and removed EZK from timing control -- pinging persisted.
Plugs are NGK 7.
The Hall sensor was kind of sticky (didn't move back & forth easily) but I oiled it and it moves freely/easily now; it didn't solve the problem anyway.
Fuel is Volvo LH2.2. I have tried two different air mass meters; problem persists. Injectors were professsionally cleaned/tested.
Exhaust cam is from the B204 head but intake cam is from 89 900 Turbo. I saw an internet post that the B204 head is thinner and therefore the timing is advanced 10 degrees but don't have specs to confirm.
Sooo...before I go hunting for another intake cam, does it sound like the problem is the intake cam? Or, could it be that I need to go hunting for yet another air mass meter?
I know of an 11:1 compression ratio B202 running 1 bar, plus a number of 10:1 B202 cars running 1 bar or more, so this shouldn't be a problem, yes?! I'm running less than 10:1...
Thanks!
-Hans