Chuggy Engine ??

[Snypa-D]

Since fitting a new exhaust system (full inc manifolds) my engine seems a bit chuggy :( I remember reading somewhere on another forum (yes I said it) that there is some ritual you can do so that the ECU accepts the new part and makes the necessary alterations.Some thing to do with giving it a good ragging,turning of the engine, turning the key in a certain way and restarting etc. can anybody remember how to do this and and tell me how or post a link up to the instructions either on here or on another forum (yes I said it again,lol)

[Guest Mister Dabsy]

Try that "old chestnut" where you reset the ECU by disconnecting the battery :unsure:

[Snypa-D]

How long does it have to be disconnected for so it does that ?? And how does the ECU do it ??

[Guest Mister Dabsy]

I'd leave it off for an hour or so... It will be shite to drive until it re-adapts !!

[prestige interiors]

i had that when the guys reloaded my auto box softwhere took a couple of day to settle down now its fine

[Snypa-D]

Cheers guys :)

Do I have to take it for a run straight after reconnecting ??

[Snypa-D]

STILL RUNNING LUMPY AFTER 300 MILES :( :( :(

Disconnected the air mass meter and to see if it made a difference.....not a bean,so maybe thats now knackered ??

Its fine after 2500rpm but lumpy as porridge up to then ??

Any ideas ???

[Guest Mister Dabsy]

Whats the mpg like? BTW you did the right thing takin her for a run !

Personally I would start with the air-flow and work towards the engine methodically, I mean filter/box, hose, MAF, hose, Throttle-Body and tightness/seal of their connections. Then if you're happy that everythings ok then move onto fuel and timing.

I cannot really help 'coz I'd need to get in there to solve it :(

[Snypa-D]

well I havent got an air box,got an induction cone.The bit just before it with wires commin out is that the air flow meter/MAF ?? If so thats the bit we disconnected to see if it made a difference (in a bad way) to how it was running,it didnt :)

But why would it go like that afer JUST having the exhaust changed ?? Them bits werent touched so surely cant just suddenly stop working ??

[Guest Mister Dabsy]

This could be because the "back-pressure" from the standard exhaust has disappeared almost completely, causing confusion with Engine Management !

It's like, carburettors would need re-jetting with a similar pipe setup eh?

[Snypa-D]

So whats the fix dude ??

[Guest Mister Dabsy]

Re-map?

Did you disco the battery BEFORE the pipes were fitted?

[Snypa-D]

MUCH DOLLAR :(

on the cards but def not so soon :(

Looks like I could be stuck with it a while then :(

No didnt disco the battery before/while pipes fitted.Did it dy after when realised how lumpy it was

[Guest Mister Dabsy]

Brief explanation of standard pipes...

Fitted at manufacture to comply with emissions first and foremost.

Help the engine by holding/slowing the flow of burnt gases to stop the engine from revving above recommended levels (this is why F1 cars can rev twice as high with the help of crank/con mods) this preserves the engine's life. Because of this, ECU will advance/retard the ignition to compensate and deliver the best firing time to the cylinder.

[Snypa-D]

Thanks for that..........I think,lol..............Im still no wiser,lmfao :D

[Guest Mister Dabsy]

Hehehehe, the point I am trying to make is that your new pipes might have given your car the lumpiness :rolleyes:

[Snypa-D]

QUESTION.............could it be cos Im using 95 octane juice ?? ie cos of the change in exhaust pressure,air intake,slight power change,ECU reset etc etc could it be cos I should now be using 97+ octane ?? Just an idea cos my ex gf's Scooby used to run perfect on 97+ but totally !Removed! on 95 ! And before you say it yes I know that my Beemer is no Scooby,or has the power like a Scooby.Its just an idea ??

[Guest Mister Dabsy]

TBH Dave, I can't see that being the issue mate ;)

[Snypa-D]

Me either,was just an idea and worth a try ;)

[Guest Mister Dabsy]

Have you considered a diffo throttle-body?

Like the M52 one or even the 3ltr/3.5?

Just a thought buddy... Dunno the part numbers yet but OEM site would give an idea :huh: :unsure:

Would you say its chugging coz its not gettin enough fuel?

Even changing the plugs for higher/lower temp ones might cure it...

[Snypa-D]

The only time its chugging and lumpy is between 2000-3000rpm if thats any help ??

[Snypa-D]

Decided to bite the bullet and booked it in to my garage for next week !! TBC.................

[mart77]

good luck mate.hope it aint too expensive