my 280i is running ough

[B19LAM]

Hi i have a 28i that starts put want rev or tick over , when its sold , the problem gets a litlle better when you get it wormed up but when you put the throttle on gentley when its hot it will rev but slam your foot it want rev it pops and farts , doe any one have any ideas

[mrzigazaga]

Hi mate..Sounds like it could be a fuel starvation but there are a lot of contributory factors surrounding the K-Jetronic MFI system...Has the car sat for long periods of time with no use?...

I remember even when mine was completely overhauled it would start on 5 cylinders and then the 6 would kick in after a minute or so...That was just the nature of the beast...
There is going to be loads of bits to check but first we need to establish an over all picture...


Thanks..Ziga

[LLantrisant]

check for a cracked hose between plenum and injection (the big black hose in the centre of the pic, marked with red arrow)



often the hose is cracked on the inside, where you dont expect / nor see any cracks on first view.

[bradderztvr]

Sorry, not sure what the problem is, but you might want to check your predictive text !!. Lol.

[ElvisWedgely]

Sounds like the timing is out.

Tony. TCB.

[jeff m2]

LLantrisant said:

check for a cracked hose between plenum and injection (the big black hose in the centre of the pic, marked with red arrow)



often the hose is cracked on the inside, where you dont expect / nor see any cracks on first view.

Good place to start...with the cheap stuff

Starting ok, but no cold tick over indicates Aux Air Device is dirty and probably stuck closed. easy to check and clean.

Once you get cold idle of maybe 1200 and it reduces to 8k as it warms then you can make moderate assumptions that the Fuel dist and WUR are working.

CIS insists on clean fuel, so change the fuel filtre and feed it some injector cleaner.

Drive and reassess.

[LLantrisant]

another easy check first:

valve clearances