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P38A Checking modulation with diagnostics
- Thread starter Datatek
- Start date
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RangeRoller dt
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Use it or lose it
I’d opt for the former
I’d opt for the former
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- Preston Lancs.
Use it or lose it
I’d opt for the former
Suppose i could rent it out to people who have fitted the electric fan mod and removed their viscous so they could get a more accurate Modulation reading.
RangeRoller dt
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You are a rascal
He haven’t really gone av he?!?
RangeRoller dt
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Always referred to as ‘uprated to 300TDI’ from what I’ve seen
unlike coil springs which is only sometimes referred to as
myfirstl322
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He haven’t really gone av he?!?
From memory, he had a fit of pique when they introduced the 'new' forum layout and fooked oft for 3 years
RangeRoller dt
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Guy deserves biscuit break
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He caused his problem, he has been told how to fix it. Got quite nasty so he can go to hell.
RangeRoller dt
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Hes not one to quit our Data.
He’s either doing his concreting
Or he’ll be back soon enough with complete spreadsheets with/without viscous.
I bet
With/without egr would be my interest.
He’s either doing his concreting
Or he’ll be back soon enough with complete spreadsheets with/without viscous.
I bet
With/without egr would be my interest.
- Posts
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- Preston Lancs.
Hes not one to quit our Data.
He’s either doing his concreting
Or he’ll be back soon enough with complete spreadsheets with/without viscous.
I bet
With/without egr would be my interest.
EGR makes no difference to running of engine. But blanking it does keep the internals of the manifold and inlet tracts clear of crap. But instead of spending £40.00 + on a EGR blanking unit, just remove your fitted one, clean it out, make sure the closure spring is sound and blank off the vac pipe to it. Job done.
RangeRoller dt
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So having a MAF makes no difference to how much fuel is put in, compared to no MAF?
Just monitors it differently?
Just monitors it differently?
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MAF has nothing to do with fuelling other than the inlet air temp it registers, which is used along with coolant temp, fuel temp to fine adjust fuel quantity. MAF is for measuring ingested exhaust gas when EGR is active, it has nothing to do with fuelling other than previously stated.
RangeRoller dt
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They bodged the IAT then
Only there as a value to stop EDC having hissy fit?
Only there as a value to stop EDC having hissy fit?
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They bodged the IAT then
Only there as a value to stop EDC having hissy fit?
Yes there is a IAT preset in the ECU for EGR engines. From memory -38.88. Taking the IAT at the MAF is rather like wearing a top coat in Portsmouth because it is snowing in Glasgow. Think it is designed to ensure EGR works under all ambient conditions.
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You're a bad man. Put the spoon down and step back holding your hands where we can see them.
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Last edited:
RangeRoller dt
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So you agree then J?
Besides
It was BMW not me
Besides
It was BMW not me
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So you agree then J?
Besides
It was BMW not me
It runs on magic as far as I'm concerned.
Henry_b
Think outside, no box required.
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So long as it runs well then that would be fine with me..
Feel like we're pushing shít uphill with this modulation carp...
Feel like we're pushing shít uphill with this modulation carp...
- Posts
- 58,170
- Location
- Preston Lancs.
Modulation is quite simple and easy to understand. It is the method used to position the injection pump static cam to adjust the point of injection. However several boxes need to be ticked to obtain a correct reading. RPM needs to be stable at idle. Engine temp needs to be stable, internal injection pump pressure needs to be stable and in conjunction with this fuel temp needs to be stable. Any of those components fluctuating or not being stable will give a false reading.
