Started hearing noise in engine area (only under load) that sounded like timing chain. Later that day, car starts stumbling bad. Severe loss of power, and this went on for some time before CEL.
Car is better after restart, for a few minutes.
CEL on first instance, P351 & P0340. NO $06 monitors indicating. Cleared codes, ran engine up to 3K, no irregular valve noise or timing noise, or misfire noted. Once car was road tested, within 5 min @ 35mph, faulted and threw P0351,P0352, also heard noise (possible combustion coming through intake?).
- Physically Checked timing, it is dead on
Pulled plugs - no arc lines on plugs or DIS coils. All plugs visibly good, equal carbon deposits (remember, only 5K miles on them).
Checked compression - 120-125, which is low according to Alldata (145 min).
I figure this could be an ignition issue, fuel delivery, or possibly a VVT (ranks low).
Logically, I think that with the engine running well without load, the CPS/CKP are likely good, but will check tonight (its been POURING and I am outside, laptop doesn't like that much ).
I will have additional probes (Sec Ignition Pickup, low current p/u) today.
Any guidence on which things to start checking first ? I am (I think) fairly compentent, and skilled with the general operation of the scope and knowledge of the different ECM components, but the folks here are much more knowlegeable.