Author Topic: Honda Jazz 2004 Idle problem and Check Light  (Read 341 times)

honda28

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Honda Jazz 2004 Idle problem and Check Light
« on: June 16, 2022, 05:36:01 PM »
Hello. I had this problem for a long time now but still drove it for about 2 years with the same problem, the problem is that when the car is at red light or in a parking lot not being driven the idle fluctuates up and down. its jumping from like about 500 to 800 rpm, no problems while being driven tho, no stalling or any sort of thing everything is smooth when it's being driven, the only thing I would say that the car is accelerating pretty slow maybe but I don't know if that's the limit of the car or the issue may cause worse performance. And also the fluctuating idle begins when car warms up, when it is cold the idle is not jumping up and down, in the winter obviously it warms up more slowly but in summer now it's only for a short time when it is working fine, car will warm up and when you stop at red you can notice the jumping idle while it's in neutral gear, the car also vibrates when its happening. I scanned the error codes and there was 5 of them: P0300, P0301, P0302, P0303, P0304. I added a screenshot of the scan result with the torque app. And also here's a short clip how the engine looks like and sounds like when it's warm: So it only happens when the car is stopped, tried to press the accelerate in neutral gear, holding it from 1,2,3 thousand rpms continuously no shakes no vibrations everything is smooth and fine, its only when you leave it alone the rpm's fluctuates. What likely could be the cause of this? Does anybody have experience with such issues? I am on budget but I want to fix the car till it's not completely damaged from this issue. The car was driven for about 7k km's in the past 2~ years , all spark plugs were changed in 2020 when I bought the car, so the spark plugs have like about 7k~ kilometers on them so I don't know if they are the issue, recently the oil and air filters were changed but nothing else. What should I do? Any suggestions? I kinda want to have some ideas before going to a mechanic or a car repair service because in my past experience with services that they will look at unnecessary things and may not even fix the car, so if someone have some ideas that would be very helpful. Thank you.

CRC

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #1 on: June 23, 2022, 07:30:19 PM »
Your error codes are saying that random misfires have been detected on all four cylinders.

Suggest cleaning the egr valve first - two 12 mm bolts and a bit of contact cleaner - very easy, takes about 10 minutes.

The Haynes manual says that the idle speed is controlled by the ECU and the way it does it depends on the type of throttle control fitted to the car.

On electronic throttle control cars, the idle speed is controlled by the ECU opening the throttle if needed.

All other models have a ECU controlled idle air control valve fitted to the throttle body which allows more air in to raise the idle speed.





CRC

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #2 on: June 24, 2022, 05:50:11 PM »
I had a look at ours today using an OBD II scanner just to see what information was available on Live Data. The reader showed

Water temperature
Air temperature
Throttle position
Manifold air pressure

Also the O2 sensor voltages and long and short term fuel trims, which probably won't be of much interest in this case.

Might be an idea to have a quick look at the others?

olduser1

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #3 on: June 25, 2022, 06:59:18 AM »
Why not take yourJazz to an autoelectrician? Ask around locally who the trade use .

Jocko

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #4 on: June 25, 2022, 10:50:35 PM »
When you say the plugs were changed I assume you mean all eight.
Check for an air leak at any of the myriad of small pipes connected to the intake. A perished or loose pipe there would cause the tick over to fluctuate. Listen with a piece of small bore pipe held close to your ear.

honda28

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #5 on: June 26, 2022, 09:54:58 AM »
Well, I took the car to the car service before writing this post too, all they said that they didn't find anything "bad" so..  :) As far as I read misfire error codes sounds like something really bad. They checked the spark plugs and said they were fine, so I don't even know if I should trust them at this point. Well I could buy 8 spark plugs they only are about 2-3 euros each sot that's not expensive, but I was reading honda jazz 2004 service manual and it said that spark plugs can be damaged by defective ignition coil, so is it worth trying to replace all 8 spark plugs? And also I took the car 1 year ago also to the car service and they could not fix the issue all they were mumbling about air leak but I did not have knowledge about it back then, all they said that it's pretty long and expensive job so I did not have money back then to leave the car for them. Currently I am thinking about changing spark plugs, ignition coils, and checking valve clearance adjustment.

Jocko

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #6 on: June 26, 2022, 07:35:48 PM »
To change 8 ignition coils is quite expensive. And the front ones are different from the rears. I had an issue with a reported misfire (never ever felt anything) and after suffering it for many months, replacing all eight plugs and coils on the suspect cylinder - all to no avail - I had to replace the middle section of the exhaust for a small leak at a pipe bracket. After that, I had no issues and 6 months on I have had no re-occurrence of the fault.

honda28

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #7 on: June 28, 2022, 08:39:01 PM »
Strange thing today. Yesterday I decided to check coolant levels and they were low, I added some yesterday. The idle rpm problems were still there so the check light(after adding coolant). Today I decided to check the ignition coil just to inspect it wanted to unscrew it but forgot my 10mm screw plug so the only thing I did I just disconnected the plug from the coil and plugged it back because I did not have tools to continue the work. So I sat in the car, and yesterday I downloaded a different OBD2 app because with the Torque app there was no option to check misfire count, I hoped that the new app would give the measurements but it didn't. And then I just decided to clear error codes once again cleared the error codes just for no reason and surprisingly the rpms were stable around 600, no check light. Well I did not care about it because couple weeks ago I did delete the codes and literally nothing changed, the check light came instantly again after starting the engine and the idle issue was not gone. But strangely this time not only it did not came back, I drove about 5km's around and it still did not come back, stopped the car, idle is perfectly still at around 600~. Thinking now what is up about this inconsistency? Couldn't damaged ignition coils or spark plugs or vacuum leak always give the misfire issue and check light consistently no matter what until they are fixed? Why would the honda just work fine right now out of nowhere especially after driving for a little, no check light or anything, it always came instantly no matter what until today.  Could have it been that the coolant levels were low? But the problems were still there after adding it, I just cleared the codes today, could the combination of adding coolant because its low and then clearing the code so the computer wont interact somehow with the old information before code clearance? Well I guess I will see if it will come back when I will drive it tomorrow or whatever.

CRC

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Re: Honda Jazz 2004 Idle problem and Check Light
« Reply #8 on: June 28, 2022, 11:18:36 PM »
https://www.springbokphotography.com/autoelectrical/2019/7/15/honda-fitjazz-crank-sensor-interference

I recently posted this link in another thread. They found that one of the exhaust side coil packs was causing interference on the signal from the crankshaft sensor resulting in misfires and error codes.

You say that you disconnected an ignition coil pack and things went back to normal, but you don't say which one.

Was it by any chance the one that they identified in the link? If it was, then there's a good chance that was the source of your problem.

Sounds like one new coil pack on the offending plug, or rerouting the crankshaft sensor cable will solve the problem as they detail.

One way to confirm would be to re-instate the coil pack and use the Torque app to look at engine rpm. If it's varying massively, then I would say that's your problem.

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