GMC - Envoy :: 2003 - RPMs Drop When Driving Above 50 After Vehicle Has Warmed Up
Sep 26, 2015
I have a 2003 GMC Envoy I6 4.2L. When driving above 50 after vehicle has warmed up it will drop rpm's by 300-500 and they go back up. This happens for several minutes at a time. It did it for over 20 minutes last night while driving home. I thoroughly cleaned the throttle body this morning (removed to clean) because in my researching for the solution it seemed that was the answer. Also left battery disconnected the entire time to allow computer to reset itself for clean TB. Took it for test drive and after about 10 minutes of driving it started doing the same thing. Took it to autozone to see if maybe they could pull a code even though there is no SEL on at the moment, but nothing came up. I am dreading if it's in drivetrain, i have only had the vehicle for about a week and a half. Bought it used from a private seller and it drove home fine the day i bought it and a couple days after, but now it's gotten worse than when it first started.
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2011 Sonata GLS, 95,000 miles.
This just started yesterday. While driving, the RPMS suddenly drop off. Depressing the gas pedal doesn't command any power output, even if I floor it, the RPMS continue decreasing and there is absolutely no power. The only way to keep moving is to completely release the pedal and then depress it again.
The transmission has been serviced twice by me and shifts smoothly. Should I plug a scan tool in ?
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2004 BMW 325i automatic - 127,000 well maintained miles - never abused - at 35-40 mph in high gear the rpms will periodically drop 200 and there is a noise like driving over small rumble strips after which the rpms instantly return - the speed does not vary. the dealer installed a warn drive shaft bearing but the problem continues - it is a bit less noticeable in sport mode - what can it be? computer - transmission - ????
The intention is to keep it for many years so if it is a transmission problem would rebuilding the current one or putting in a new one be the more advisable solution?
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06 Elantra Limited, 96,xxx miles. When I'm idling at a light or something, the Rpms drop for a split second, almost to the point of stalling, but recovers. Happens in a split second. Does the same thing even when driving, but does it more frequently when idling. It even does that when I first put my foot on the throttle to accelerate from a red light.
I've cleaned the throttle body but it still does it. I've taken it to 3auto parts stores. One said that battery was bad. The other said the battery is fine but alternator is producing low. The last said both are fine.
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Two weeks ago Sun, truck ran fine, however Mon morning all hell broke loose. Truck was running very sluggish and stalling while coming to a stop. My first thought was tune up. I replaced the plugs and wires. During this I found that i could not get a socket around the ever loved driver side rear plug so i was only able to replace 7 plugs however in that process i managed to break the metal coolant tube that runs to the heater core.
Aday later replaced the entire intake manifold,egr valve, egr tube, IAC valve, both coil packs, fuel filter, tranny fluid and filter. During the removal of the intake i looked at the rear spark plug and found that a screw had been wedged into the hole breaking the plug and got it changed now it is all back together and the truck runs amazing however did not solve the low rpms during stopping. ive replace the above and checked fuel pressure which is good.
I have a TPS sensor just haven't installed it yet not sure if it is related to the issue. Tranny guy says it may be a bad solenoid or TC however last night I reset the PCM and drove it it ran flawless. this morning the problem returned which leads me to believe its not the tranny. ok one last kicker that 6 experts have failed to answer when i manually put the truck into 2nd gear the engine dies! no studder no fighting just quits.
Truck is a 98 F150 4.6 V8 186,000 miles i have yet to
1) change TPS.
2) clean throttle body.
3) clean MAF sensor. n
Not sure if any of this has an effect on the issue. There is only a EGR insufficient Air flow code..
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I have a 2003 Camry 3.0l v6. Stalls at lights random.
Currently the car stalls at stops but this doesn't happen all the time it can go a month in between the problem occurring its very random. While sitting at a light the rpms drop and then it revs up and cycles like that for quite a while. This will also occur while cruising at a low speed while I'm just coasting the rpms will go up and down. I can compensate while stopped by power braking and keeping it at its normal idling rpm. I have no check engine lights and can't seem to determine what would be causing this issue.
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IOur 2003 suburban often gets a "reduced engine power" displayed by the computer and the RPMs drop to below 1,000. The vehicle will not accelerate and will not go above 1,200 RPMs no matter how much gas it is getting. Flooring the gas pedal has absolutely no effect and the truck continues on its merry way at about 20 miles per hour.
I have been told by various amateurs that it is the gas lines or electronics that regulate the gas flow. The reduction in engine power seems to happen randomly, but most often if the vehicle is idling for too long (and I'm sure the 110 degree heat doesn't work). I can get it fixed much quicker if I know what the problem may be.
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So I know there has been lots of posts on surging issues and how to troubleshoot. My truck is a 97 f150 4x4 xlt 4.6l v8. I have noticing surging and dropping in my RPMs lately. No CEL. I have kept a journal when I notice when it happens. I only have issues when I am driving around 40-50 mph and if I go over bumps/pot holes/rough spots in roads or when I'm braking over bumps/pot holes/rough spots, my truck surges/RPMs drop CEL flashes on and off only during these instances. Makes me think something could be loose or something causing this. It has stalled at times when having to brake fast (yellow light, etc.). Where to look first? 1997 F150 4x4 4.6 V8...
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I have a 1997 forkd F150 with a 4.6L Romeo engine. I have recently rebuilt the engine and now since it is put back together I am having a issues that i cannot pin point. When the truck is running and in gear my RPM drop to around 500 or below and my oil pressure drops and comes back up when the rpm's come back up this an intermittent problem and I have replaced the IAC valve and every once in a while i get a P0401 code for the exhaust recirculation. I think I am loosing some kind of vacuum. It was not doing this when I tore into the truck. It seems to be running okay not hesitation.
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Have a 2003 F-250 with 174,000 miles. Recently replaced CPS and ICP and it's running much better. It normally idles at about 700 rpm. Lately, after driving for any distance above ~40mph, when I come to a stop, the rpm won't drop below about 850 rpm. If I shift to neutral (automatic trans), the idle drops to around 700. At the next stop sign/light, it's back up to around 850.
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My '03 7.3 is "surging" on idle. When warmed up, and idling, the RPMs will drop by 300 or 400 for a few seconds and then will correct and shoot back up. It cycles like this (every 5 seconds-ish) continually . I just put in a new IDM and checked the UVCH - is there a separate idle control mechanism that I need to have a look at? (2003, 7.3, 214K, stock).
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the wife's '01 Excursion has developed a new idling quirk. While sitting, it will briefly drop rpm's. You can hear it, and see it on the tach gauge. No other noises or problems, except for the brief drop in rpm's.
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2003 7.3 excursion.. The truck starts every time revs up and idles about 3 seconds then the rpms drop and it tries to stall out catches itself then revs backup and idles rough similar to if you have got air in the fuel lines from changing the fuel filter.. About 1 in five times the truck will stall out and it starts and immediately and idles rough but the rpms and everything runs at speed and rpms don't drop again! This is a reman engine/transmission recently installed.. The mechanic who installed it was unable to figure the problem out.
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I ran out and test drove a new to me 2001 F350 7.3L tonight. Everything seemed good, until I got back from the test drive. I pulled in and was sitting there with it idling. It seemed to idle fine, then a very small miss and very small shimmy then idle fine again; then another small miss and another shimmy. It continued like clockwork. Every time it seemed to miss and shimmy, the RPM would drop just a little, but not much. Does an ICP sensor sound like the problem, or maybe something more serious? 2001 F350 7.3L with 235,733 miles new trans, turbo replaced at 150,000 something miles. No blow by. Idled fine before driving, also drove fine. It doesn't seem to surge when idling, just kind stalls and shimmys for a split second then idles fine for a few seconds.
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My 2003 Ford Explorer, Eddie Bauer 4WD is making noises when the vehicle is at 2000RPMs. Below or above 2k RPM's no noise. Sounds like a very angry rattle snake. I seem to drive at speeds that require it to be at 2k RPM all the time. So needless to say as fall is approaching and I have the windows open, my hair is now falling out and not blowing in the fall air. I want to get it looked at, but don't know what to tell the mechanic to look for.
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Recently I have noticed that when on a tune other than stock I am getting a surge at idle - my RPMs drop to around 621-630 then shoot back up to 660-675. On my stock tune my RPMs stay around 640-667 and don't cause the surge (felt as a shimmy so to speak). Is there anything else that causes a similar symptom? I attribute it to tuning due to it only happening when running anything but stock but could be wrong.
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My GMC Envoy is making a loud reviving sound upon start up and while driving getting louder the faster I go. It also makes this noise while in park. I have Manuel transmission however it almost sounds like the car is in need of shifting to another gear... I'm hoping it's not an expensive problem!! There is no engine light coming on alerting me to a problem. It's a very loud revving almost whining sound.
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Today my Prius surprised me. I drove it out of the garage and it had 2 bars charge. After a few secs, as usual, it fired the ICE. Ambient temp was 21C/70F. The ICE stopped after only 1 min as per 1-min fuel consumption screen. Maybe it was a bit longer (more than 1 but surely less than 2) - it never warmed up that fast after a full night cooling off.
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I stuck my phone down by the electric motor and recorded this while the car was running:
My '06 has been making this odd noise coming from the front of the vehicle. It's coming from somewhere under the hood on the right side (the driver's side), and I think it's under or next to the electric motor.
It happens when warmed up, and only when the vehicle is turned on. It doesn't seem to be related to the ICE, because the noise happens regardless if the ICE is running or not. In fact it happens rarely, so when I heard it I jumped out and tried to locate it (and recorded it with my phone).
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Took my 03 envoy that is having some voltage/electrical issues to get tested! Everything checked out fine! But then in the afternoon after sitting in the sun I went to start it an when I turned the key all that happened was the check engine light came on and nothing else. Would not turn over nothing, not a sound! That was about 4pm..... Now I got home and at 10pm went out to check it and it started right up.
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03 gmc envoy. Whether I put little in my tank or fill it up, 80% of the time when I turn the car on after putting gas in it the dash says "low oil pressure stop engine" for about 30 seconds. That's the only time it ever says it and the pressure gage goes up to 40, where it's always at. I check the oil regularly, there's a slow leak between the motor and tranny but I keep it full, it's never low. Can this cause major damage to the engine?
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