On highway, at higher speeds (50-70), I notice that the vehicle's acceleration will pause and the rpms will bounce a bit. Best description I can give is that it feels as if someone were constantly pinching and releasing the gas line. Short revvv...revvv...revvv. The vehicle doesn't lose power. I get where I am going. And it only occurs up at these higher speeds.
View 12 RepliesI have a 2002 chevy Trailblazer that when you put it into drive there is a vibration.It does not do this in park or neutral. I have checked the engine mounts and transmission mount, and they look good. The vehicle has a little over 118,000 miles on it and the engine runs and drives great except for this vibration that i do not know where it id coming from. What may be my problem?
View 1 RepliesSymptoms- won't rev over 3000-3500 rpm's, upon acceleration (especially uphill) seems to struggle and won't accelerate much at all, seems as if trans changes fine. BTW, throwing no codes at present.
What I have already tried...new air filter, new fuel filter, had cat. check (was told stopped up but when removed found it was not and truck did the same even with cat. off), o2 sensor (upstream) replaced, battery disconnected to reset computer.
After reset of computer, runs a little better but still not good. Seems to start if you accelerate to quickly or when truck reaches around 40-45 mph.
When turning in both directions, front end makes a CHEEP-CHEEP-CHEEP-CHEEP-CHEEP sound. Frequency increases when speed increases.Brakes are NOT engaged when this happens. Goes away when coming out of turn.
I am sure the problems could be multiple, but what is your first thought? Not that it matters, but its a 2002 Chevy Trailblazer.
Problems overheating. Have replaced thermostat and the housing for it...fan clutch and water pump. Its still overheating especially going uphill when RPM's are higher. How can I check to see if there is a radiator blockage?
View 1 Replies2002 ranger edge 3.0 5spd. Truck idles perfect, but when you get rolling and higher rpms feels like the engine is missing. loos of power and shakes. I replaced the usual, plugs and wire's, seemed to work for a bit but came back. I cannot get any info on the scanner and have checked all the fuses. I am thinking coil pack but don't understand why it idles perfect and only misses under acceleration. No check engine light on.
View 14 Replies2003 Explorer Sport Trac... The air bag light initially flashes once, pause, twice, longer pause, repeat. I think that is LFC (light flash code) 12. What it means and a possible solution?
View 2 RepliesSituation: In automatic, coming off say a highway in the 30 to 50 km's (20 mph) range and then trying to accelerate quickly but there is a 1-2 second pause/delay/lag before it kicks in and launches.
It is not 100% consistent but it happens often enough to bother me.
Experience with this issue? What is the cause and is there a fix?
I have a 2004 TB that won't start. I pulled out my hvac b fuse to reset that system and now my car won't start.
The lights come on but don't dim, the 4WD indicators don't come on and all I hear is a high pitch sound and nothing else. I don't hear a crank. I don't know where to start looking for a solution.
I have a 2004 chevy trailblazer LS EXT, the passenger side low beam has gone out, I have replaced the bulb and it still doesn't come on.. The fuse looks just fine to I have switched it with a new fuse and it still doesn't come on.. I don't know what else it could be?
View 1 RepliesMy 2003 Xterra has been a great car. Few problems until last year I had to have the timing belt replaced (at 120,000 miles no biggie), the day that I got back from Iraq. Well everything has been great since then until a couple of weeks ago I started noticing some acceleration problems. When I press on the accelerator, especially when the car is cold, it will rev, pause, then resume normal accleration. I would like to point out that the whole car pauses, not just the reving. Mechanics seemed stumped and I would rather know what to tell them to do rather than let them dig around and charge me a bunch.
View 1 RepliesChevy trailblazer 2007
Between 1,000 and 2,000 rpm (only 20% of the time) I hear, and feel, a clunk that seems to emanate somewhere near / behind the driver seat. The error code (an 834 ? possibly but I forget exactly...but def in the 800 series) says " transmission component slipping".
Trans oil full, and clear.
The clunk sound happens on any terrain, and is very random. And going up-hill does not bring it on. The clunk's been happening for about 2,000 miles.
The orig transmission was replaced 15,000 miles ago.With a used one. Total mileage on car now 75,000.
Mechanics give varied explanations, and prognoses (none are good) but no one knows what's going on for sure.
Ok, I have a 95 F150 5.0. It's sat for 6 months with the engine taken apart. I just finished putting everything back together with a new alternator. Well, I pulled a bone-head move and forgot to connect the harness when I fired the truck up. Other than not charging though, it ran fine. When I connected the harness, it began to chirp and shudder at low RPMs and squeal and vibrate at higher RPMs and it over heated VERY QUICKLY.
So hot the case was too hot to touch and the pulley smoked the belt. The engine didn't even have time to get up to operating temperature. I've had the alternator replaced twice, and this last one tested good putting out 14.5 volts. The work I did on the engine was to replace the valve springs, install a direct drive timing gear, replace a spun harmonic balancer, bypass the smog pump because it froze up, new distributor, a new ECU and O2 sensor.
I've got an automatic transmission 2002 elantra 2.0 that I purchased in 2009. About a year after owning it a weird problem developed that I've just sort of lived with since. Between 25-40 mph my RPMs occasionally "bounce" persistently by an amount between 500 (mild) and about 1000 (severe). There's a bit of fluctuation insofar as what RPMs/speeds it happens at depending on outside temperature and how warm the engine is (higher temps correlate with this issue happening at higher RPMs and a more pronounced fluctuation), but it's a consistent issue every time I drive. It *seems* like my car is always trying to push down the revs, hits a certain low point depending on the gear/speed, then jumps up just a bit only to edge back down. Lather, rinse, repeat. It's not simply a display problem as I can feel and hear the engine revs changing.
No fluctuations at idle. Above 3000 RPMs it's ALWAYS smooth sailing. When I'm actively accelerating there's never a problem, even if my acceleration stays in the revolution problem range. The car is never in danger of dying, but if the cruise is engaged (ESPECIALLY in the 25-30 MPH range at operating temp) the car shudders uphill - I assume this is because the RPMs dip a bit too low for the gear the car is in. If I press the throttle the car responds normally. This bouncing RPM issue itself NEVER causes the car to shift gears in response, and if it's happening and the car DOES shift everything works fine until it goes back to trying to maintain RPMs in the problem range. When it happens I usually just increase speed by 5MPH and it goes away, though if the car is warm and the speed limit doesn't allow me to go fast enough to get out of the problem range it just does the same thing at the slightly higher RPMs.
When the problem started my car threw an OBD code - I didn't read it myself and brought the car to a random service shop who SAID they changed the throttle position sensor, and the code was gone, but a few days later it was doing the same thing without throwing a code. I tried changing the fuel pump thinking it was a fuel delivery problem, but that didn't solve anything. I put seafoam in the fuel system monthly so I'm fairly certain that fuel system gunk isn't an issue. The symptoms haven't changed AT ALL during the 6+ years this has been happening.
The kicker is that a few years ago I found a SUPERB mechanic - the first one I've ever actually trusted to be not only competent but also honest. Described the problem and even demonstrated it to him. When I brought in my car to have the struts and mounts replaced he spent two days trying to figure out what was causing the RPM issue too... and couldn't nail it down.
Possibly related: after starting the car - regardless of how long it's been running - there's a brief delay between pressing the gas pedal and the engine responding. Delay seems *slightly* longer the colder it is outside, but it's never more than a second and a half. No further delays unless I shut the engine off and turn it on again. Replacing the fuel pump didn't affect this matter whatsoever.
Random rough idle about every 30 seconds at low 700s (rpms) and it'll bounce up and down a little. The code was p1515 (No CEL or other lights have come on yet) which is something about the intake manifold valve and there is an air-shooting noise that is pretty loud but just sounds like air that's being lost somewhere like maybe a leak and that happens when i rev right before you can hear the engine rev the air/shooting noise occurs. I don't really think I'm losing power but I got the car recently so maybe I am and don't notice it. If this is a common leak or something with the intake manifold valve let me know,
View 2 RepliesSo I've been noticing some issues with my 2011 GTI with only 1800 miles. I had some weird drive by wire issues, like the motor holding its RPMs with the clutch in for excessive time, a start up and idle issue (TPS?), my passenger window is very slow (heard that this is common), and now my driver window hesitates and pauses when rolling it down... ERR!
And yes I will take it to the dealer, its just that I live 100 plus miles away.
I've got a misfire problem with my Focus. It started about a month ago and did not trip a code until last week. It stumbles on acceleration between 2,000 and 4,000 rpms. It is only a slight stumble and although noticeable, it does not impede driveability much. Last week I was able to get it to finally trip an OBD code. P302 - Cylinder 2 misfire. I changed the plugs and wires with no effect. I thought I had it narrowed down to the coil or injector until my wife noticed a new wrinkle.
Under normal driving conditions the misfire is annoying, but my wife found that if she turns on the A/C, it is undriveable and will not accelerate past 30 mph without some patience and a neck brace for the bucking. My first thought was the A/C compressor was freezing up. I turned off the A/C and left the blower on and it would not stop missing. I turn off the blower and it smooths right out to the annoyance I described first.
Right now I drive the car without A/C and blower whenever I accelerate. If I'm going a steady speed, all is well and I can run the blower and A/C.
I have a 2003 F250 with the 5.4 and I believe I am having a fuel delivery issue. I took out yesterday and stopped to get a drink at the gas station, came back out and the truck wouldn't start long enough to idle. It would start, barely bounce off zero rpms and die out. I checked the fuel interia switch and it was down. I tried turning the key back and forth thinking it might reset the fuel pump or something and that didnt work. I get the truck towed home and couldn't get it to start last night. I go out this morning and it starts, come home from work and now it won't. This happened about 2 years ago and I never did anything about it, but it took 2 years for it to happen again.
View 2 RepliesI have an '08 Accord Cpe with a V6 and 5-speed auto. transmission. When driving on a level stretch of road trying to hold the speed at 40mph the engine speed will bounce up and down between 1400 and 1700 RPM. The engine is warm. The transmission feels like it is trying to up-shift and make the car go faster thus nearly impossible to hold the speed at 40mph. If I put the transmission in 3rd gear so it can't shift up there isn't this problem. I have also noticed a lugging or hesitating when trying to accelerate when the engine is cold. I wonder if these are related issues?
View 15 Replies2012 GTI 6 Speed
Both needles bounce while maintaining a constant speed, example going 80mph in 6th, RPM moves +/-100ish RPM and speed is 1-2 MPH. The car doesn't actually move, just the gauges. Engine doesn't sound like its miss firing MPG was 30 going 80 so it seems to run just fine. Going through the gears playing around its smooth and normal.
I'm on a road trip so very limited on anything to diagnose, just looking for some insight.
my ac pump kicks on and off no matter what the rpms are at. the ac comes out warm and when i try to charge it the pressure goes up to overcharged and then goes to 0 because it kicks off every 10 seconds.
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