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If you hear a wheezing noise, it could be a restricted catalytic converter. Otherwise, could be caused by any variety of things and would need to be gone over by a competent shop.If you hear a wheezing noise, it could be a restricted catalytic converter. Otherwise, could be caused by any variety of things and would need to be gone over by a competent shop.
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Re: My jeep has a hard time going past 55 mph. 4...
Is it missing out, if so, i would check the condition of the spark plugs and wires, also check or replace your fuel filter and air cleaner if you haven't already done so.
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1. The testing has to start with the vehicle under 122 degrees F. Start the engine and idle for 2.5 minutes in Drive (auto) Neutral (MAN) A/C and rear defogger ON.
2. A/C OFF, accelerate to 55 MPH at 1/2 throttle and then 3 minutes of steady state cruise at 55 MPH.
3. Clutch engaged (MAN) no braking decelerate to 20 MPH.
4. Accelerate to 55-60 MPH at 3/4 throttle and 5 minutes of steady state cruise at 55-60 MPH.
5. Decelerate, no braking to end the drive cycle.
In some cases the Powertrain Control Module (PCM) will go into a logic lock not letting the readiness monitors run. Removing the battery cables and touching the two together will normally take care of the logic lock condition.
I'm going to assume you have the 3.4 V6 engine which uses direct ignition with a coil on each plug. Could be ignition or fuel related. A weak spark/coil will allow the engine to run on all 6 cylinders at idle but miss under load, especially when going into overdrive at 45 mph. Not enough spark to jump the gap. Same thing with low fuel pressure or dirty injectors. Not enough fuel when the engine is working hard. Usually when you get a hard miss you will get a trouble code for the cylinder that is not giving power. Have you changed the fuel filter in the past 12 months ?
sounds like you have either clogged injectors or a bad tranny also you have a governor that wont let your rpms go over a certain number of revolutions this is to prevent the engine from seizing
I too have that problem. I own a 2005 GMC Yukon. Shutters between 40 + 55 mph. I thought for sure the stumble I felt was a plug or coil pack because it only does it under a load. With A/C on the whole truck shakes! But it wasnt the plugs or coil packs. Answers anyone?
If you hear a wheezing noise, it could be a restricted catalytic converter. Otherwise, could be caused by any variety of things and would need to be gone over by a competent shop.
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