i was wondering if any of your tecno's could shed some light


my brother fitted new coils this morning to a sti ra. they solved the problem with the high speed miss fire, but after test driving, on the way back home myself and my father notice a knocking noise coming from the engine. Sound like bottom end/pistions

i did a search and found something about the maf sensor, my brother had to take the air box out to fit the coils would/could he of knocked damaged something by mistake. i could be barking up the wrong tree completely. i usaully am! lol

the car is a sti ra 1996, and is bog standard

thank you

 

Some people on here have suggested that a dodgy MAF sensor can cause Big-End failure .............. to my Engineering mind thats just plain BOLLOX!!

Sounds more like something has been moved and is banging on something else (the airbox?) ..... anyone worth their salt will tell you within minutes whether its big end or not!!

Good luck!

Pete

 

I am not mechanic but from personal experience I was co-driver in two cars (MY99-00) with dodgy MAF and both suffered big end failures after some kms!
Coincidence?
I don't think so...

 

I do!

Come on, the MAF Sensor tells the ECU how much air is entering the engine ..... just how is that going to knock a Big-End out?? You don't need to be a Mechanic to work out that it simply cannot.

Pete

 

causes lean running leading to det.the car can actually feel faster due to the lean mixture and poor ecu knock control.

det can eat through a piston but also sends shocks down the rod that compress the shells/bearings leading to failure.

pete will probably never have this issue as he never goes over 3000rpm .

 

i got my brother (a mechanic) too have a look at it and last night he confirmed that it is the bottom end, and luck would have we have managed to find someone to do it locally and they have got a bottom end in as well.

so thanks for the replies peoples.

 

Hope it all gets sorted!

Pete