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The idle on my 2004 f-350 5.4l just today has been?
racing at high rpms and the transmission is taking longer to shift. What could be causing this problem?
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There could be several issues that could cause your GMC Envoy's transmission to not shift gears properly and the RPMs to rev high. Here are a few potential problems that you may want to consider:
Low transmission fluid: If the transmission fluid is low, it could cause problems with the shifting mechanism. You'll want to check the transmission fluid level and add more if needed.
Faulty shift solenoid: The shift solenoid is responsible for directing transmission fluid to the appropriate gear. If the solenoid is faulty, it could cause shifting problems.
Worn transmission bands or gears: If the transmission bands or gears are worn, it could cause the transmission to not shift properly and the RPMs to rev high.
Clogged transmission filter: A clogged transmission filter can restrict the flow of transmission fluid, causing shifting issues.
Faulty transmission control module (TCM): The TCM is responsible for controlling the transmission. If it's not functioning properly, it could cause shifting problems.
I would recommend having a mechanic diagnose and fix the problem for you. It's important to address transmission issues promptly, as they can lead to further damage if left unchecked.
Engine idle speed is limited by reducing the amount of air entering the engine. When an accelerator pedal is pressed, it pulls a cable which opens a throttle plate which then allows more air to enter causing engine RPMs to increase. At an idle, the throttle plate should be closed as to not increase the RPM. There's also a part called the idle air control (IAC) valve which controls how much air bypasses the closed throttle plate at an idle. Lastly, air could enter the engine via an intake gasket or vacuum hose leak; the same rules apply, the split hose or gasket allows air to enter the engine and RPMs will rise. To summarize, a throttle plate not closing, and IAC valve stuck open, or a split intake gasket or vacuum hose could all cause a higher than normal idle condition. You can read more about how to troubleshoot high idle conditions here: https://www.yourmechanic.com/article/how-to-troubleshoot-a-car-idling-at-a-high-speed-by-tim-charlet
Automatic transmission or manual transmission?
Either is serious...Honestly.. I would have it towed to a qualified professional transmission shop.. ( do you live near anywhere that has a active drag strip (drag racing?).. If you do,, TAKE A PEN AND PAPER... go there, go into the pits.. ask some of the mechanics who is the best transmission man in town...THEY KNOW ABOUT TRANSMISSIONS!! .. this IS WHAT I DID. when mine quit..He was less expensive than the "chain shops" and did a DAMN GREAT job!!..with a warranty!!
You need the engine computer scanned for faults first, if nothing shows up you likely have a problem with the transmission, likely it is not shifting into overdrive.
the high rpms can be from a vacuum leak and the hard shifting from a problem vacuum actuator on the transmission
check for a broken missing hose to the transmission
run the fault codes to check for other sensor problems
Try cleaning the throttle body and check the gap on all the spark plugs also all electrical sensor plugs and battery terminals this could be related to engine temperature also if to hot rpms stay up longer to cool off but maybe your idle air control valve is bad when did it start?
You'll want to doublecheck & make sure the Overdrive is turned on. That's a high rpm for 55, even high I believe for Interstate cruising at 65-70.
Possibly get back to the dealer immediately if it's not the Overdrive switch.
There are issues with some models that concern the RPM staying around 4,000 even at idle & under the right circumstances, a transmission won't shift as it should based upon engine & driving signals that the Trans computer uses to determine when to shift.
Check your fluid first & remember, Overdrive doesn't work until the fluid reaches a certain temperature.
My 1st suggestion would be to get a scan done for the check engine light. I'm not talking about a simple 'code reader' but an actual scan tool so all of the different sensors and perimeters can be read. You will need to get one or find someone with a scan tool which can do OBD I vehicles.
If the engine isn't running correctly this could cause the transmission not wanting to shift. 2 vehicles that come to mind where I've seen this happen.
One was a Pontiac and it wouldn't shift into overdrive. Problem was the thermostat which was stuck open and it wouldn't allow the engine to get up to proper temperature which kept the transmission from shifting.
The other was a Ford Explorer that the lady thought for sure the transmission was bad. After a test drive and investigation it was found the catalytic converter was mostly plugged which wouldn't allow the engine to achieve the proper torque and RPMs to get the transmission to shift.
Now granted neither of these examples are an exact duplicate of the problems you are having. They are simply to illustrate that engine performance (or the lack of) CAN affect the way the transmission shifts.
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