Cam/crank correlation codes for intake cam
Looking for some help on this vehicle, starts fine smooth idle but lacks power most of the time, I performed an in-cylinder pressure test and verified that the exhaust valve is retarded but my codes indicate a intake timing issue so I would assume the intake is effecting the exhaust as well. Both banks showed no back pressure issues.
I removed the intake valve reset solenoid and flushed and tested fine. Also removed both camshaft profile solenoids flushed and tested ok. There are no hits on Identifix on this engine and also contacted someone at a local Volvo Dealer whom I worked with in the past and these engines are not known for VVT or chain issues. He did point out that they have issues with cam reset valves so I decided to replace it. I did see a difference in the chamber positions.
The engine is however high mileage with 191k. After replacement and during the road test, I had more power and seem to be ok after re-adapting, but the issue returned and codes resurfaced. There isn't much info on the function of the profile solenoids and there roll on cam timing, I only found a test procedure. What's odd is the profile solenoids are only on the intake cam front and rear. The exhaust cam, from what I read, is not PCM controlled. Has anyone run into this particular problem on the engine?
I also tested the intake upper and lower air flaps with the scanner and they responded. However, during my road test, it did flag a code for one of the flaps which could cause an issue obviously but this shouldn't cause my cam timing codes.
hi Greg. are the codes still present after the reset valve replacement ?
yes codes returned, also now have a trans code for torque load p1719, but looking at info I dont think its causing the lack of power as the trans is not in a limp strategy, volvo has no diag for the code. going to scope the network just to make sure there is no issue. i think i'm looking at VVT hub issue though as I dont see a big change in my intake cam readings.
if its still setting the cam code i would scope the cams and crank signals and watch them move with scanner in hand to see the difference. with the scope you should be able to see the "slow moving cam" the code is setting for. does sound like a cam phaser/hub to me too. if its moving at all that would indicate to me there is oil getting to the hub and hub is problem
After replacing the Reset Valve it is better performance wise but stilling pinging which indicates a timing issue, I am pretty confident that the chain is stretched on this engine, I did scope the cam sensors and would have expected them to match pattern wise at idle but they are definitely not in sync. Volvo does not allow for cam reset activation or the cam profile solenoids. I tested all 3
i thought too that the chain might be stretched. just searching through trouble codes i found p001621 cam position correlation with crank. i suspect that is the same as the 1622. that would help support the chain stretched thought. the rear of the camshafts have alignment slots in them and timing can be checked that way. or disconnecting the cam actuators should keep it in base timing too…