Scotty have 2002 Chevy Avalanche 549,110 miles (still great gas mileage).
.Scotty
question has to do with truck jumping up RPM's when I drive about 12 mile all sudden the truck seems reduce power. Then bam! the RPM's go from normal 2500 to 3500 rpm. I have to keep it under 50mph so it will not keep rising up rpm. The service engine lights blinks while I am pressing gas pedal, but stops when I stop pressing. ODB codes show p0300 (replace fuel injectors all 8), p0449, p0106 and co267 & c0236. Any advice to help repair till new truck-currently not in budget as dealing with wife stroke. Till better I have to stay with old Blue
truck is 2002 chevy 1500 avalanche 2wd 549,110 miles
Unless a downshift takes place if your RPMs jump without a corresponding increase in road speed the transmission is slipping.
You didn't say if the truck still has its original engine and drivetrain. If so you can bet it's pretty much worn out at that mileage, most of them don't make it that far.
Old Blue still has all his teeth-yes this is the original transmission-only major thing that gone wrong with truck since. Truck seems to downshift and then high RPMS, have to keep at round 50mph so RPM's won't keep rising
Do you have access to a Tech2 or equivalent scan tool for diagnostic purposes? At least something that can read and record live data?
Chuck have scanner to get codes, but it doesn't record live data. I may have to take to AutoZone to have them scan see??
- **High RPMs and Reduced Power:** The rising RPMs could be related to issues with the throttle, fuel delivery, or ignition system. It might be beneficial to have a mechanic inspect the throttle body, fuel injectors, and ignition components for any malfunctions.
- **Blinking Service Engine Light (SEL):** A blinking SEL often signifies a serious issue. The P0300 code suggests multiple misfires, and addressing the fuel injector replacement might be a good start. Additionally, checking spark plugs, ignition coils, and the fuel system could be necessary.
- **P0449 (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction):** This code is related to the vehicle's emission control system. It could be a faulty vent valve or a wiring issue. Inspecting and potentially replacing the vent valve might help.
- **P0106 (Manifold Absolute Pressure/BARO Sensor Range/Performance):** This code relates to an issue with the MAP sensor. A malfunctioning MAP sensor can affect engine performance. Checking the sensor and its connections for any problems might be necessary.
- **C0267 & C0236:** These codes relate to the ABS system. While they might not directly cause the RPM issue, addressing them could be important for overall vehicle safety. Checking the ABS sensors and related components may be required.
Given the complex nature of the issues, it's advisable to consult with a professional mechanic for a thorough diagnosis and appropriate repairs. I hope your wife's recovery goes well, and I understand budget constraints; a mechanic might be able to prioritize essential fixes.
Chuck have scanner to get codes, but it doesn't record live data. I may have to take to AutoZone to have them scan see??
I don't know if AutoZone checks live data, that would be a lot of information they'd need to provide. I thought they only pull codes.
Another issue is that you really would want to record the live data when the problem occurs so you can analyze it afterwards. It doesn't take a very expensive scanner to do that, my $60 CGSULIT SC-301 scan tool can record and even graph. I'd think that BlueDriver could probably do that as well and that's about $100. (I have a Tech2 as well.)
Of course you can check the easy stuff like filters, spark plugs, fuel pressure, or clogged catalyst. You can also look up the codes to check possible causes for each, though it is possible you have one or two root issues causing all of them. I would troubleshoot the misfire first. If it hasn't already ruined your catalytic converter(s) it will over time. A flashing check engine light means to stop driving immediately to avoid such damage.