2007 Chevrolet Suburban
Mileage
135,892
Service Date
6/21/2021
Services Performed
- P0300 misfire detected random P0121 throttle position sensor 1 performance P0521 engine oil pressure sensor performance Can feel engine misfire mostly at idle, and sometimes slightly under load. Misfire counters show number 1 misfire at idle. Inspect ignition system found number one spark plug insulator cracked and exposing most of the electrode. This will cause a misfire at idle. This concern is typically caused by oil consumption from piston rings. Oil gets on spark plug and causes temperature variance and ends up cracking the insulator. Advised to replace all spark plugs and monitor condition. Ultimately this vehicle will need an engine. NOTE: there is a technical service bulletin for oil consumption and spark plug problems on cylinders 1 and 7. This technical service bulletins talks about replacing the left valve cover with a revised piece as well as removing the oil pan to install a shield for the active fuel management relief valve then cleaning/un sticking the rings. On cast iron blocks, like this model has, it then says to perform an engine oil consumption test, then replace pistons and rings if necessary. We've done a couple of these Tech bulletins and replaced the valve cover and shield and it hasn't made a difference. They've all ended up needing lower-end work. Found a glitch in the throttle position sensor at a particular spot causing the code P0121. This is an intermittent fault. Needs replacement throttle body to fix this issue. Currently the oil pressure is normal. Freeze Frame data as well as customer's description of when the oil pressure went low shows that this happened at freeway speeds. Since the engine was at high RPM during failure suspect sensor issue. It's unlikely the oil pressure was actually low. There is also a filter underneath the oil pressure sensor that should be replaced. Advise to replace sending unit and filter. Due to location performing a manual oil pressure test is more expensive than just replacing the sensor. Advise to drain oil to proper level and also add seafoam 2 engine oil to possibly help free up piston rings. Then change oil in 500 miles.
- See check engine light Diagnostics
- Left engine mount broken. Clunk is the engine hitting the hard stop.
- ENGINE OR TRANSMISSION MOUNT – Remove & Replace – C1500,K1500 Engine,Front,Left – [Includes: R&I Fender Liner. Includes: R&I Intermediate Shaft.]
- SPARK PLUGS – Remove & Replace
- OIL PRESSURE SENDER OR SWITCH – Remove & Replace – [Includes: R&I Intake Manifold.]
- After throttle body replacement RPM stuck High about 2200 RPM. This was even after running the standard relearn procedure. PCM needs software update to latest calibration for replacement throttle body. There was a change in throttle body Hardware that requires software update.
- Engine RPM normal after software update
- Smog inspection
- Certification fee
- Drain oil and add ATF
Mitch B. gave our service a 5 star review on 6/21/2021
