[andru38002]

Friends please help me with my problem.
I began to feel a strong loss of power from 1500 to 2500, this happens when the motor is not heated to 85 degrees Celsius, as soon as it heats up everything passes and the car goes ok.
I connected my HP tuner and recorded the logs, I was surprised when I saw that a knocks appears in this range.
Sensor No. 1 shows that the voltage on it starts to rise to 4 volts, as I understand it on the left side of the engine, everything passes above 3000 rpm, no knocks.
I changed the knock sensors, I changed the oxygen sensors, the problem remained
I don't know what to do anymore.

 

[_scorpion_]

Friends please help me with my problem.
I began to feel a strong loss of power from 1500 to 2500, this happens when the motor is not heated to 85 degrees Celsius, as soon as it heats up everything passes and the car goes ok.
I connected my HP tuner and recorded the logs, I was surprised when I saw that a knocks appears in this range.
Sensor No. 1 shows that the voltage on it starts to rise to 4 volts, as I understand it on the left side of the engine, everything passes above 3000 rpm, no knocks.
I changed the knock sensors, I changed the oxygen sensors, the problem remained
I don't know what to do anymore.

Hi there,
Forged engine internals? (Rods and Pistons)

 

[andru38002]

the engine is stok, compression 14.5/15

 

[_scorpion_]

I have similar issue but with forged engine and custom exhaust. Tried to dial in with HPT and the their forum (some guys are quite helpful there). Managed to reduce the retard significantly but not to get rid of. They say that Mahle pistons are very noisy, so I live with that. Once the engine warms up - retard is zero. But that obviously is not your case.

 

[andru38002]

yes, I have come across the fact that forged pistons make noise, but here I do not understand whether there is actually a knock or not.

 

[_scorpion_]

Well, if it does not exist when engine warms up - I'd say that is not. Try using better petrol and (98 or 100) and see if retard is lower. If it's the same - most probably it is not a real knock. As far as I understand the principals ))

 

[_scorpion_]

Anyways, pls let know if you find the root cause - I'd check if I might have the same issue . Thx

 

[andru38002]

I have tried gasoline 98 and 95 and 100, there is no difference in the knock, yes of course I will write to you if I figure it out

 

[malamri424]

Pull spark plugs and compare.

Also post your log, might be too much ignition advance. Some parameters increase timing like low intake air temperature and low engine coolant temperature. And I wouldn't drive hard before the engine warms up anyway.

 

[andru38002]

Pull spark plugs and compare.

Yes, I looked at the spark plugs when I checked the compression, they are equally good

 

[andru38002]

Also post your log, might be too much ignition advance.

how to upload a log?

 

[malamri424]

how to upload a log?

When you test with HPT you can use VCM scanner application to record engine parameters. Upload the recorded log as an attachment here.

 

[andru38002]

When you test with HPT you can use VCM scanner application to record engine parameters. Upload the recorded log as an attachment here.

There is a log file, how can I upload it to the message here? Writes your file type is not supported

 

[_scorpion_]

the logs of mine are below - with cold engine and huge retard, after warm up without. all done with same conditions - start from a complete stop under very mild throttle.

can only post pics, attachements as *.txt or graphic files are only allowed, that is what TS is writing about.

ps: topicstarter, I hope you do not mind I interfere in your thread? the problems seem to alike even though the engines are different (stock/modified)

 

[andru38002]

ps: topicstarter, I hope you do not mind I interfere in your thread? the problems seem to alike even though the engines are different (stock/modified)

Of course everything is fine, maybe together we will solve this shit

 

[andru38002]

he logs of mine are below - with cold engine and huge retard, after warm up without. all done with same conditions - start from a complete stop under very mild throttle.

and during the knock, what is the voltage on knock sensors 1 and 2? My voltage on knock sensor 1 rises to 4 volts and on knock sensor 2 does not reach 1 volt

 

[andru38002]

Here is an example

 

[malamri424]

the logs of mine are below - with cold engine and huge retard, after warm up without. all done with same conditions - start from a complete stop under very mild throttle.

can only post pics, attachements as *.txt or graphic files are only allowed, that is what TS is writing about.

View attachment 233071

ps: topicstarter, I hope you do not mind I interfere in your thread? the problems seem to alike even though the engines are different (stock/modified)

Ok I believe this is definitely true knock, because the knock sensor voltages are normal after warm up.
6.4s are known for low speed knock but this is too much 9° at 21% TPS is not normal.
1-2° short term knock is normal with initial tip in, and between shifts at WOT.

Do you have a tune? If yes, send me a link to your HPT post I'll go take a look.

 

[_scorpion_]

and during the knock, what is the voltage on knock sensors 1 and 2? My voltage on knock sensor 1 rises to 4 volts and on knock sensor 2 does not reach 1 volt

jump up to 5v, primarily bank2

 

[andru38002]

Do you have a tune? If yes, send me a link to your HPT post I'll go take a look.

Yes, I have everything. If it's not difficult for you to look at my log files and my tune, maybe I could send you an email?