C/K :: 1998 - RPMs Will Surge By About 500 - 600 While Driving At Constant Speed
Aug 14, 2012
A few days ago my 98 C1500 started having what I can only imagine is some type of torque converter issue. While driving at a constant speed the RPM will surge by about 500-600. This surge does not coincide with any type of acceleration, it's more like the converter is letting go and the RPM's just rise and fall back down. The fluctuations also seem to stop after about 15 minutes of normal driving. I have had no real noticeable transmission issues. At first i assumed it was my tranny fluid just breaking down so to get me home I used a bottle of Lucas.
The bottle seemed to do the trick for only a couple of days and now the problem is back...no better, no worse. The only difference I have noticed is that before the addition of the Lucas my fluid looked perfect and now it seems there is a bit of varnish. No smell, nothing seems burnt, just a little dirty. I haven't changed the tranny fluid for about 70k and the truck now has roughly 160K on it. My concern is that if I do change it the transmission will crap completely and I'll be on the hook for a rebuild.
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my 2006 GX has 95000 miles and recently i've noticed a slight hesitation followed by a slight surge in speed while driving at a constant speed. it almost feels like i'm pushing the accelerator then releasing it. its a very mild difference but i'm guessing tranny and have 5k left on my warranty. it occurs at a variety of different speeds but most noticeable at about 35-40mph and up around 55mph.
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I've got a 99 f250 5.4 that runs like a top. In the last 6 months I've been chasing a little problem. It doesn't happen all the time but seem to be happen more and more. While driving any speed If I let off the gas the RPM's hold at around 1500 then surges down to 1000 then back up again to 1500.
Does that 2 to 4 times then all good. Give it gas again it does it again. It kind of does it when it wants. Could be fine for a trip around then next trip it acts up again. Checked a lot of the vacuum lines, PVC valve and replaced the idle control next to the EGR valve. EGR is next.
Idles and runs fine except the surge thing..
P0401 code as well.
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This truck has 180km on it and runs fine except as of lately i have developed a surge while at constant speed. When i step on the gas it does not seem to happen.....it only happens when I reach a constant speed. The odd time it will surge at idle and the engine will rev up and down on its own also. When at highway speed it seems to not do this. The truck never dies completely....just surges slightly.
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I have a 2002 camry with 212000 miles on it and just lately when driving at a constant speed 60 mph or over it starts to buck or jerk a little bit and you can feel it in the seat. I've had the throttle body cleaned and put in a new mass air flow sensor and it hasn't fixed it yet. What might be causing this? It doesn't do it when accelerating or slowing down.
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We have a 2003 Passat GLX, 43000 miles, V6, AWD. I've noticed recently that when driving at constant speed the engine will surge about once every second or two. It's very regular, and on a smooth road I can also notice a bump in the drive train, very similar to road bumps.
I've taken it to a dealer, since I believe it is a transmission issue, and therefor covered under warranty. There are no computer codes stored for faults in the transmission, they've said. However, they started by pursuing the fuel injection system (though no code was stored), and then wanted to fix a faulty coolant sensor (since found not to be faulty).
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My 1996 Honda Accord V6 has a stuttering problem. It only happens (or is only noticeable) when driving at a constant speed. It is most noticeable when driving in the 45 - 55 mph range. It feels like the engine has millisecond breaks in power. And this does not happen all the time. Some days, it drives just fine with no problems. It idles fine. The problem is not noticeable, if there at all, during acceleration.
One other piece of information that might - or might not - be relevant is that the tachometer seems to be out of its mind. It bounces all over the place up and down. This also does not happen all the time, and it seems to me, though I'm not 100% certain, that the stuttering problem only happens when the tach is crazy..I have had no luck getting a mechanic to diagnose the problem. They claim the tach problem is totally unrelated.
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I have an 04 Elantra GT and have been noticing a jerkiness when driving at a constant speed on the highway. I haven't noticed it around town or while accelerating. I also have noticed that when I disengage the clutch on the highway, the engine sometimes doesn't respond right away, or it even may surge. This has happened when exiting the highway when I disengage the clutch. The engine will slow, then speed up close to 3000 rpms.
I also had a check engine light come on and couple months ago. The code indicated that the upstream O2 sensor was bad. I took it out and cleaned it, but didn't replace it. Is this a likely culprit for this set of symptoms? If so, how can I test the sensor to be sure? I heard that I could disconnect it and run the car and see if the surging lessens, but wasn't sure if that was a good thing to do.
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I have a new 2015 Subaru Forester and I noticed the following problem: When driving at a constant low speed, in the 20-30 MPH range, the car bucks/hesitates slightly off and on, while driving. At first I thought the engine was missing, but I noticed the RPM was at about 1000 RPM, very low. And a missing engine would cause a "check engine" warning.
So I think this is a combination of the CVT and the engine lugging. The CVT should move down a notch to a lower "gear" but it doesn't, so the engine is forced to operate at a problem speed. A normal transmission would downshift, I would think.
Can I do anything to solve this, other than manually shift to the low range?
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Recently it feels like the transmission is 'hunting' drops a gear, picks up a gear when driving constant speed on flat roads. 2.0T with tiptronic. Additionally, very intermittent, the car will get a shimmy around 48-50 mph. feels more transmission related and it is not the tires since it is an intermittent issue.
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I have a 98 F150 4x4. I had some trans trouble so I pulled it out and had it rebuilt. Now when it shifts into drive the rpms speed up right before it shifts. What is causing the trans to do this? It doesn't do it all the time, only if I take off faster the usual which is most of the time.
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First & main issue: I throttle on, the RPMs jump, speed drops. I think I dealt w/ this before in my old Toyota pickup by replacing the clutch master cylinder. Is that right?
Secondly, I don't know if the engine of this lil car has been rebuilt, but the smoke from under the hood has been alarming. It smells of oil, and I've seen some spots that appear to have leaking oil dropping onto the exhaust, but the smoke keeps coming from various spots.
I really enjoy driving this lil car, it's my first Subaru and my first wagon, but if the trouble is just now starting for me, at over 210,000 miles... I've replaced a few things, but I've never owned a newer(ish) vehicle (except a Harley), and come to expect to do work every once in awhile. I'm fairly regular w/ preventative maintenance, but not strict about when to change fluids or flush things (i.e. transmission or radiator). Maybe I should just sell this one and move on.
I also hit a deer the other day going pretty fast and fortunately only busted out the passenger side head light, fog light, and blinker. The other day being over a month ago. I just don't drive at night and try to avoid right turns. Any thoughts on where to get cheap replacement parts? I can't seem to find anywhere that'll sell me those plastic bits for under a few hundred dollars.. strange considering a necessary part like a master cylinder is only $40..
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I have done a extensive tune up on my intrigue, I have been having a problem last six months or so with it losing rpms while driving, idles fine and only loses rpms while foot is barely on peddle, If I give it more gas jumps up to normal, what may be causing this?
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The brakes surge with more power when the brake pedal is held at a constant pressure. My guess it has to do with the brake booster. But normally a failing booster would result in less braking ability not more.
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My f350 6.0 has seem to have lost its power, while I was driving home it would only accelerate at one constant speed, and driving up hill it would not accelerate at all, I also noticed an elevated exhaust temperature.. There are no warning lights or dash lights indicating any problem.....
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I have a 1990 Lincoln Mark VII, black on black, basically one owner, excellent condition... except one problem. While driving the car my speed dropped to 40mph, while my RPMs rose to 4000. Upon checking I found the plastic clip, which holds the linkage from the transmission to the accelerator had snapped. I replaced the part and still have the same problem...is my transmission smoked or is there an adjustment?
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I have a 2008 Nissan Rogue and I bought it used and it has worked great until recently. The issue I have is after 1-2 hours of driving at a consistent speed of 70 MPH it will stop accelerating past 2.5-3 RPMs(x1000). When it started happening, I was able to pull over, turn the car off for 10-15 minutes, and it won't happen again until my next trip.
I can't seem to recreate the issue except after going on a road trip. It's kind of scary when trying to go up hills and when I slow down when I come into smaller towns and get to a stoplight, I stop, wait until the light changes, and when I try and accelerate again it's jumpy and doesn't respond for 3-5 seconds which can be annoying to the person behind me.
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have a 98 rodeo, with a V6 & Auto trans. have an intermittent problem - as I am driving engine will occasionally drop to idle speed and then pick back up to driving speed. Engine keeps running smoothly, just at idle speed.
CEL does not come on / no codes
Replaced Throttle Position Sensor - and thought I had found the problem, but since it is so random, it just didn't happen again for 1 1/2 weeks.
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I recently had intake manifold gaskets replaced in my 98 gmc sierra 4x4 pickup 5.7 . The day I drove it home from the shop it ran fine, even day after but the next day I noticed it seem to idle a little rough and even at normal driving, sometimes seems worse than others. No service engine light has yet to come on. Could there be vacuum leak, trash in intake or bad wires and plugs. Plugs, wires, rotor button and distributor cap are only year and half old.
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I have a 98 Silverado, 2wd, 5 liter V-8, 180,000 miles. Occasionally, my truck will lose power. Driving down the road I lose speed and cannot accelerate. When I depress the accelerator the motor does nothing. This happens at any speed from take off to highway speeds. When it begins to happen I lose speed slowly for maybe 30 seconds then the service engine light comes on and the problem gets much worse. Sometimes it will sound like it's back firing but the sound is muffled. This seems to happen more often in damp weather but it can happen in dry weather too. And it doesn't always happen in damp weather. It happens in the morning or afternoon. Auto Zone put their tester on it and a code comes back for O2 sensor but the guy didn't think that would cause the trouble I'm having.
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So my 20th AE has been wrecked. But here is the issue, the car will idle for a about 30 seconds to a minute but surge from 1500 rpms to around 750. But after that, it won't idle. If I let it sit for a couple of days, then it will idle for a little bit then die again.
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