#1: rough idling need help and suggestions asap Author: woody1982-1, Posted: Fri Nov 04, 2016 5:24 pm ---- ive got a 1.4 hdi and it didnt have the maf sensor plugged in so i plugged it back in and the idle speed drops every couple of seconds, sounds like the car is trying to stall basically, so i plugged in a scanner and it said air intake temp senor voltage input too high so replaced sensor and maf but didnt change at all, the car idles perfectly with the maf unplugged i need help dont know what else i can do and the mot is due next week
also changed air filter
#2: Re: rough idling need help and suggestions asap Author: Walton450, Location: LeicesterPosted: Mon Nov 07, 2016 9:08 pm ---- Sounds stilly but my car idles crap if you start it with your foot on the throttle. I have to discount the battery for a couple mins and then it runs fine.
#3: Re: rough idling need help and suggestions asap Author: Sim, Location: West CountryPosted: Tue Nov 08, 2016 4:20 pm ---- My 2.0 HDi ran around with a shot MAF without me knowing (so probably equivalent to when you unplug yours)
During extra 30bhp remap pro_steve from HDI-tuning said that I have to get that sorted, as map needs it.
He said car was driving fine because ECU comes up with failsafe default values, and it's perfectly OK for emissions with factory's engine tune and in this climate.
So why can't you just pass your MOT with MAF unplugged? All my MOTs were in January, pass with flying colours seemingly with shot MAF too
#4: Re: rough idling need help and suggestions asap Author: gazza82, Location: South BucksPosted: Wed Nov 09, 2016 4:22 pm ----
Sim wrote:
So why can't you just pass your MOT with MAF unplugged? All my MOTs were in January, pass with flying colours seemingly with shot MAF too
If the engine management light is on, it will fail.
woody1982-1: fit a new MAF ?
#5: Re: rough idling need help and suggestions asap Author: Sim, Location: West CountryPosted: Wed Nov 09, 2016 6:01 pm ----
gazza82 wrote:
Sim wrote:
So why can't you just pass your MOT with MAF unplugged? All my MOTs were in January, pass with flying colours seemingly with shot MAF too
If the engine management light is on, it will fail.
You're right, if EML sniffs some emissions problem.
Official response:
I funnily came across myriad of debates online where people think any time EML is on it's a definite MOT fail, but that ain't right
When testing SRS MIL (Malfunction Indicator Light) lamps we are only looking to see if the lamp indicates if there is a fault with the system. If no lamp is present or it doesn’t illuminate then it can’t indicate a system fault, so it can’t be failed. Some vehicles may also incorporate warning messages on dash board displays; these are in addition to any MIL lamps and should not be used as a reason for rejection.
Also ABS lamp lit is a fail, but EML is not safety feature, therefore only advisory.
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All my MOTs were in January, pass with flying colours seemingly with shot MAF too 
