High revving in between switching gears

Tiny
SNJESKA
  • MEMBER
  • 2005 PEUGEOT 206
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 260,000 MILES
When I start my car, it idles at about 2,000 RPMs. When I start driving it is normal except when I switch gears it spikes up to 3,000-3,500 RPMs. At stop lights I have to shut my car off because it is just revving like crazy.

Please help.
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Tuesday, April 5th, 2022 AT 11:13 PM

9 Replies

Tiny
BORIS K
  • EXPERT
Hello,

High idle is often caused by unmetered air being sucked into the intake system.
This can easily be checked by spraying water or WD40 or similar along the throttle body seals, intake manifold seals and injector seals

A good video.
https://youtu.be/vKAnFQ-S6hk

Also see link below for high idle issues.
https://www.2carpros.com/articles/engine-idles-too-high

Also check to see if the engine light is on, if it is best to carry out a CAN scan using a suitable diagnostic tool, if there are any fault codes, please post them with your next reply.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Please let us know how you get along.

Cheers, Boris
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Wednesday, April 6th, 2022 AT 2:13 AM
Tiny
SNJESKA
  • MEMBER
Okay, sorry about the delay. And I ll apologize now for the long post because quite frankly I m just not sure what matters and what doesn t.

First, let me thank you for those links. I spent all morning reading through the list of questions about Peugeots trying to find the same problem. That video for the spraying is so informative, I will definitely be trying that also.

I bought this car about 6 months ago from a used car dealership, but they also have a garage. When I bought it I was told that a sensor needed to be replaced but it s not urgent and they would do it when I came in for my APK a couple of months later. They stated that was the reason for my check engine light, which has been on since I bought it.

About 2-3 days after I got the car, I had this exact same problem. I took it to the place I got it from, and he hooked it to a computer and the only fault code it was getting was heating system circuit speed one. If I remember correctly. The guy says he had absolutely no idea why it would be revving like that. Thinking he just didn t want to admit the car was a piece of poop. I took it straight from there to another mechanic. Also hooked it up. Same fault code. But he lifted the car and, in the end, says a sensor just was unplugged. Now he didn t say exactly which one, but he plugged it back in and I didn t have the problem again until yesterday.

Now, I did take the car back to the place I got it from to do the APK and they mentioned nothing about any sensor. They just said they had to change a belt. Which I did have a belt that was making noise, but it sounds absolutely the same now so if they changed it actually, I have no idea, but it also makes me wonder if they maybe unplugged that sensor again? Because that mechanic that had plugged it back in had told me that it may cause some problems on the dash such as saying it s overheating but to rest assured it is not actually overheating. Umm.

Now I did have a problem a week ago where the car was chugging and had no power when I hit the gas. Like I had it to the floor and it s barely picking up speed. I checked the air filter, it seemed clean. I then changed the spark plugs and coils myself. Now I ve watched and helped a lot of my male family members around cars but have never actually done everything myself. Is it at all possible that I did something wrong there? I haven t had the chugging problem at all since then though.

Also probably not related but the day it started doing this again, I had added a bottle of fuel injection cleaner to the gas tank and filled it up and I drove about 250 km then. And when I got home as I parked it the RPMs started jumping.

Also, it doesn t always do it. For example, on my way to work it was so bad that I had to shut the car off every time I had to stop at a light. When I went to brake, I started it. It was normal. When I was going home it was not revving at all, but it seemed like it was getting the shaking again. And when I switch gears there s a noticeable little drop in power?

Now, before I found this site, I was actually thinking about changing the O2 sensor and crankshaft sensor. In your opinion should I do that anyway? I m so sorry for the length again, I truly appreciate any reply. And please bear with me, I am in no way a mechanic, and I am so far from my car savvy family or friends.

Unfortunately, I just don t have the means to take it to get hooked to a computer until Friday, so I am not sure if there are new codes showing. I will try to message a few people to see if anyone has a diagnostic tool at home, if I find it, I will update with codes.

Thank you again so much.

Snjezana
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Wednesday, April 6th, 2022 AT 7:22 AM
Tiny
BORIS K
  • EXPERT
Hello,

Regarding the spark plug change, did you set the gap correctly?
The gap should be 0.9mm

How to replace spark plugs.
https://www.2carpros.com/articles/how-to-change-spark-plugs

I do not think a faulty crank shaft sensor or O2 sensor will cause these erratic idling issues.
A faulty crankshaft sensor would cause non start or cutting out issues.
I have not heard of a faulty O2 sensor causing high idle issues.

Inspect the throttle body, make sure that it is not contaminated causing a possible sticky operation. It can be cleaned with a brake or carburetor cleaner.

How to.
https://www.2carpros.com/articles/throttle-actuator-service

How it works.
https://www.2carpros.com/articles/how-a-throttle-body-works

Failing this I can only suggest that you check that all engine sensors are plugged in correctly, unplug a sensor after another, check that there are no bent, loose or corroded pins and plug it back in.

Please get the vehicle scanned at your earliest convenience.

Cheers, Boris
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Wednesday, April 6th, 2022 AT 9:22 AM
Tiny
SNJESKA
  • MEMBER
Thank you again so much for your reply. Regarding the spark plugs. I had no idea you had to set their gaps. That s actually basically the only thing I ve done with cars but neither here nor my time in America with their cars did I ever do that. Should I take them out and check them?

Sorry I m waiting to try all your suggestions because it s been nonstop raining and I don t have a garage. But I just went and started it and it seems normal. Last night though I took it to the gas station like a km from my house and it seems to have been worse. It didn t just rev steadily it was like vroom vrrroooom vrrooom up and down. Still only in idle but it s definitely keeping speed in drive too.

I also spoke to my neighbor about using his computer and will do that ASAP, but our work schedules won t allow it until Saturday, I think.

Now I know this is a stupid question because obviously the car needs to be fixed but do you think I will be doing a lot more damage if I drive it to work in the next two days? I m just worried because when I push the gas it seems like electrical power almost gets cut. It almost shuts off and kicks in.

Thank you so much for your patience. I truly appreciate it.
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Thursday, April 7th, 2022 AT 2:02 AM
Tiny
SNJESKA
  • MEMBER
I ll add that my work round trip is 50km.
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Thursday, April 7th, 2022 AT 2:03 AM
Tiny
KASEKENNY
  • EXPERT
Just to jump in and address the issue of driving it to work. It is more than likely you will not do much more damage past what it is doing now for some time.

However, I would suggest you limit driving as much as possible. It will only get worse so if you don't have any other options then I would think it would be fine for a couple hundred Km.

Clearly, we are not there looking at it but based on what you described I would think this should be okay.
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Sunday, April 10th, 2022 AT 9:51 AM
Tiny
SNJESKA
  • MEMBER
Thank you so much for your reply! I m still trying to catch my neighbor to hook it up to a computer, our schedules are so different. But since the last time I wrote the car has been acting normally. None of those crazy rpm jumps and all that and now I m so confused. I work night shift tonight yet then I have 4 days off so I was going to try all the suggestions from above but if it s acting normal now, how will I know what was wrong? Do I wait for it to start acting up again?

Thank you, guys, so much for your time and patience truly.
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Sunday, April 10th, 2022 AT 10:10 AM
Tiny
KASEKENNY
  • EXPERT
Unfortunately, that is the frustrating thing with an issue that does not happen all the time. If something like this is not acting up, then you will not find what is causing it. We need to do any testing when this is acting up or everything will test normal, hence the engine is operating normally.
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Sunday, April 10th, 2022 AT 11:57 AM
Tiny
SNJESKA
  • MEMBER
Okay, thank you so much! So as soon as it happens again, I will hook it up to a computer and I m sure I will be back here for further advice. :) Thank you again truly.
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Sunday, April 10th, 2022 AT 4:42 PM

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