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45 Posts
Hello there guys, I have visited these forums a few times since ownin my Redline but havnt had to post yet, But sadly today is the day I must discuss a odd series of problems.
to start, I was driving in town running errands to get ready for a fishing trip in the mountains, a check engine light came on. It seemed fine so I drove it to the mountains, it's top end performance at about 4500 to 6000 rpm seemed very slugish and weak. A scan revealed code p0420, freezeframe data revealed the engine was idling and fuel system closed at time of failure. I jacked the car up and tested the voltage output of the o2 sensors, both seemed normal but I replaces the hot side on a hunch. That code diminished and the light remained, another scan revealed a CYL 1 Misfire and then code p0068. The Reader has said somehtin about throttle position and airflow correlation. After clearing the codes the CYL 1 misfire never came back but P0068 is triggerd by revs above 3500 and then goes into a reduced power mode and cannot be driven safely in traffic. Befoe i is triggered it makes some awful ticking noises which I cannot pinpoint (maybe the the throttle body's drive by wire interface flickering?)
I have jacked up the car and disassembled the typhoon system and examined the filter, the pre filter was a little dirty from the dirt roads I journey on occassionally but thats why I have it. the K&N seemed fine and well oiled still red even since my last servicing of the system not too long ago. The MAF is cleaned regularly with oil chages and throttle body and supercharger seem clean. Im going to look for vaccume leaks today, the supercharger's bypass valve actuating diaphragm (for lack of a better term) has some dry rotted hoses that lead into the vaccume system. Im assuming that this shuts the valve at high vaccume levels to engage the most boost from the roots of the SC.
A dry compression test revealed around 120 PSI in all cyls except 3 which gave 110 and the plug was a bit eroded (probably an unrelated issue to the main problem)
I believe the CAT converter problem is unrelated to the new DTC code but if the converter were clogged for example the back pressure could probably cause a problem with manifold pressure and trigger the Low power mode? Then agian it never did this before the O2 sensor was replaced, Why did it start now?
At this point im all ears guys.
to start, I was driving in town running errands to get ready for a fishing trip in the mountains, a check engine light came on. It seemed fine so I drove it to the mountains, it's top end performance at about 4500 to 6000 rpm seemed very slugish and weak. A scan revealed code p0420, freezeframe data revealed the engine was idling and fuel system closed at time of failure. I jacked the car up and tested the voltage output of the o2 sensors, both seemed normal but I replaces the hot side on a hunch. That code diminished and the light remained, another scan revealed a CYL 1 Misfire and then code p0068. The Reader has said somehtin about throttle position and airflow correlation. After clearing the codes the CYL 1 misfire never came back but P0068 is triggerd by revs above 3500 and then goes into a reduced power mode and cannot be driven safely in traffic. Befoe i is triggered it makes some awful ticking noises which I cannot pinpoint (maybe the the throttle body's drive by wire interface flickering?)
I have jacked up the car and disassembled the typhoon system and examined the filter, the pre filter was a little dirty from the dirt roads I journey on occassionally but thats why I have it. the K&N seemed fine and well oiled still red even since my last servicing of the system not too long ago. The MAF is cleaned regularly with oil chages and throttle body and supercharger seem clean. Im going to look for vaccume leaks today, the supercharger's bypass valve actuating diaphragm (for lack of a better term) has some dry rotted hoses that lead into the vaccume system. Im assuming that this shuts the valve at high vaccume levels to engage the most boost from the roots of the SC.
A dry compression test revealed around 120 PSI in all cyls except 3 which gave 110 and the plug was a bit eroded (probably an unrelated issue to the main problem)
I believe the CAT converter problem is unrelated to the new DTC code but if the converter were clogged for example the back pressure could probably cause a problem with manifold pressure and trigger the Low power mode? Then agian it never did this before the O2 sensor was replaced, Why did it start now?
At this point im all ears guys.
