Jump to content
hurricane

URGENT - Fearing the worst, car just started acclerating itself to the redline, now abandoned on layby

By hurricane, in Technical help (E46)

Recommended Posts

Scottfreee3 Newbie

Scottfreee3

Posted
Posted

Alright guys, the only thing coming on in the computer now is EGR??

What you guys reckon, valve, cooler or something else?

The pedal has 2 sensors (1 does idle to 50% trottle and the other does 50% to 100%). A long shot but it could be this.

I asked my mechanic about the cam sensor again and he insists this is the problem. The problem was the ecu was losing contact with the sensor causing the engine to revv like mad until you turn the key off. I didn't ask if it came up as a code or not. But he said the engine would start no problem.

Link to comment
Share on other sites
dooge Newbie

dooge

Posted
Posted

99% going to be electronic. Its got to be either a combination of two faults that are causing a weird signal for the ECU and its revving its tits off or something major has failed. Purely from a safety aspect electronic stuff can be controlled if it fails so id expect BMW to set anything like that into limp mode. If it fails, revs uncontrollably and causes an accident wouldnt it? I hope you get it sorted buddy, sorry my post isnt a cure!

Link to comment
Share on other sites
Matt_330CI Newbie

Matt_330CI

Posted
Posted

There's no way oil leaking into the cylinders would make it rev like that. It would just tick over.

The only way revs increase is by opening the throttle body letting in more air. On old cars that was simply a cable attached to your throttle pedal but on new cars its electrical.

There's most likely a throttle position sensor that sends a signal to the throttle body and that's where I'd be looking.

Link to comment
Share on other sites
hurricane Newbie

hurricane

Posted
  • Author
Posted

There's no way oil leaking into the cylinders would make it rev like that. It would just tick over.

The only way revs increase is by opening the throttle body letting in more air. On old cars that was simply a cable attached to your throttle pedal but on new cars its electrical.

There's most likely a throttle position sensor that sends a signal to the throttle body and that's where I'd be looking.

Any body got a guide as to where this sensor is located and how to replace it?

I really cant afford to be taking this to a mechanic again and I do have an e46 318i lying in the yard for parts.

cheers

Link to comment
Share on other sites
StuBeeDoo Newbie

StuBeeDoo

Posted
Posted

The 320D does not have a throttle position sensor, it has a throttle pedal pedal position sensor actually on the pedal......

Correct. Diesels don't have a throttle body. No throttle body, no TPS.

Link to comment
Share on other sites
hurricane Newbie

hurricane

Posted
  • Author
Posted

The 320D does not have a throttle position sensor, it has a throttle pedal pedal position sensor actually on the pedal......

Correct. Diesels don't have a throttle body. No throttle body, no TPS.

So whats my best options here, just remove the pedal and fit another?

A mate of mine has a 320d for breaking.

Replace pedal and see what happens?

As for diagnostics, my mechanic used a neighbours computer who owns an indy BMW garage. So the right diagnostics was used.

The car is now even worse, doing it now from third gear onwards.

Link to comment
Share on other sites
19ryanh93 Newbie

19ryanh93

Posted
Posted

Fuelling on a 320D has 3 pumps and one filter. It has the lift pump (in the tank) this then feeds a pre supply pump (low pressure) which is situated under the passenger footwell which is in line with the filter (also under the passenger seat) this then goes up to the high pressure pump in the engine bay attached to the rail which is driven off the timing chain. There is then a return which goes to the passenger side of the tank.

It might be worth doing a leak off test on all four injectors while your at it (probably nothing at all) but mine had injector issues not so long ago as well as an EGR that was well absolutely rock solid so might be worth whipping that off and giving it a clean (takes 5 mins to take off)

Sent from my iPhone using Tapatalk

Link to comment
Share on other sites
Scottfreee3 Newbie

Scottfreee3

Posted
Posted

Fuelling on a 320D has 3 pumps and one filter. It has the lift pump (in the tank) this then feeds a pre supply pump (low pressure) which is situated under the passenger footwell which is in line with the filter (also under the passenger seat) this then goes up to the high pressure pump in the engine bay attached to the rail which is driven off the timing chain. There is then a return which goes to the passenger side of the tank.

It might be worth doing a leak off test on all four injectors while your at it (probably nothing at all) but mine had injector issues not so long ago as well as an EGR that was well absolutely rock solid so might be worth whipping that off and giving it a clean (takes 5 mins to take off)

Sent from my iPhone using Tapatalk

He has the older engine which is not common rail. Not sure where the final pump is located on it .

Sent from my HTC One_M8 using Tapatalk

Link to comment
Share on other sites
RoryW Newbie

RoryW

Posted
Posted

Definitely sounds like somehow it's running on it's own oil, probably knackared turbo

If it were a turbo you wouldn't be able to turn the car off unless you stall it.

Link to comment
Share on other sites
RoryW Newbie

RoryW

Posted
Posted

I'd be disconnecting all electrical, start up and if it idles then start the process or re connection.

I've had a pulse generator cause similar issues on my Motorbike. When it happened in 3rd gear it came as a shock!

Link to comment
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
Go to topic listing
×
×
  • Create New...