97 Z3 knock sensor and misfire

[Cardriver333]

I just got my 1.9 Z3 running after it sat for 7 years, changed oil/filter, fuel filter, trans fluid. Maybe had some bad gas mixed with new fuel. The check engine light is on so i read the codes with inpa and this i what I got back except i left out the part at the bottom of each one that says "errorcode: D3 D2 D2 40 FF..." that long string of numbers and letters. If anyone wants that info let me know and I'll add it.

108 permanent supply

255.0 [1]
255.0 [1]
255.0 [1]
0.60 h

Error frequency: 1
Logistic counter: 40

Occured before (rel. BZ)


Maximum value exceeded
Error currently not available
Static error

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211 knock sensor 2 sensor signal

Error frequency: 4
Logistic counter: 40

Engine speed 2440 1/min
Load signal 2.90 ms
Engine temp 58.50 grad c
Occured before (rel. BZ) 0.60 h

Maximum value exceeded
Emissions relevant error after debouncing MIL on
Error currently not available
Sporadic error

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62 misfire detection sum error OBDII ERROR!!

Error frequency: 1
Logistic counter: 79

Engine speed 2560 1/min
Load signal 6.05 ms
Engine temp 94.50 grad c
Occured before (rel. BZ) 0.40 h

Maximum value exceeded
Emissions relevant error after debouncing MIL on
Error currently not available
Static error

___________________________________________________

50 misfire detection cylinder 1 OBDII-ERROR!!
Error frequency: 1
Logistic counter: 79

Engine speed 2560 1/min
Load signal 6.05 ms
Engine temp 94.50 grad c
Occured before (rel. BZ) 0.40 h

Maximum value exceeded
Emissions relevant error after debouncing MIL on
Error currently not available
Static error

___________________________________________________

75 Misfire detect - damaging sum error OBDII ERROR!!

Error frequency: 1
Logistic counter: 40

Engine speed 2880 1/min
Load signal 7.15 ms
Engine temp 94.50 grad c
Occured before (rel. BZ) 0.40 h

Maximum value exceeded
Emissions relevant error after debouncing MIL on
Error currently not available
Static error
___________________________________________________

63 misfire detect - damaging cylinder 1 OBDII-ERROR!!

Error frequency: 1
Logistic counter: 40

Engine speed 2880 1/min
Load signal 7.15 ms
Engine temp 94.50 grad c
Occured before (rel. BZ) 0.40 h

Maximum value exceeded
Emissions relevant error after debouncing MIL on
Error currently not available
Static error

 

[NZ00Z3]

It could be a bad gas problem?

Misfires have 2 sources:

• Electrical
• Mixture

With INPA, have a look at the rough running chart. Is the problem just one or 2 cylinders or is it all 4 cylinders.

• If it is only one or 2 cylinders, then it's specific to the cylinder. Most likely electrical
• If it's all cylinders, then there is something common. Old fuel, mixture or mixture control.

Electrical

• Swap plugs and see if fault follows.
• As you have the 1.9L Z3, you'll have the 4 coils in one unit. So you can't swap coils between cylinders to see if the fault follows. Unless you get creative with the harness connector wiring and swap pins so that you can swap coil leads.
• Harness. This is an inspection job.

Mixture

• Check your fuel trims. An OBD2 scanner is good for this as the values are both in % If any are greater than 8% then you have vacuum leaks to find. Smoke test the engine. See below.
• Checking fuel trims with INPA is difficult as they have different units and are harder to understand.

Mixture Control

• Dirty Idle control valve
• Dirty MAF, especially if you have one of those aftermarket Hot Cold Air Intakes with an oiled air filter.
• Old/lazey Pre-Cat O2 Sensor. Watch it's voltage signal in the scanner and make sure that it is cycling between around 0.1V to 0.8V

 

[Mike Fishwick]

I would clear the codes, then fill up with 98 octane fuel a couple of times and see how it goes. After 7 years of stagnation with UK 95 octane fuel it is a miracle that the engine started at all!

 

[bear2020]

Looks like cylinder 1 has a prob may be worth checking the electrical connections? When I had a misfire it was across all the cylinders and everyone showed a fault.

Put an injector cleaner in the fuel as well and take it for a run it cleared a lot of codes on other cars I have had that were stored for a while.

 

[Cardriver333]

Does anyone know what is supposed to be plugged into here? I can feel the male one sucking air when i put my finger near it

 

[Cardriver333]

Also this one?

 

[bear2020]

Both pictures show the Air Pump F vacuum control hose missing
Part number 11731437785