Big missfire

[deanflowers]

Had a mate of mine do the clutch in the FD yesterday, not too bad a job he said as it took less than 4 hours, but bringing it back put his foot down a bit after driving it for 15 mile and had a big backfire and its now missing like hell.

Ive been up to see it and noticed the petrol light is on so ive put more juice in it and had it running for a while but still no better. Am i right in thinking he has sucked a load of **** through it?

Todays plan is change the plugs as they dont look the best and put some fuel/injector treatment through it.

Is this the most likely problem or is it possible doing the clutch he has disturbed something electrical. Ive had a quick look underneath and everything appears to be connected.

I\'m thinking its likely to be fuel related but this may just be a coincidence

[leon]

how rough does it sound? if you think it could be electrical have a look into reading the ecu fault codes (this will only cover sensors and some components though) :Thumbs-up there are destructions on how to do this in the tech sticki section.

[Red and Single]

Sounds like it\'s gone pop

I hope not, but it might be rebuild time

[rx7veilside]

not a expert but if running lumpy and boost guage is fluttering at idle then i would say a lost tip
possible low on fuel gave it beans fuel supply lost ran lean and popped a tip but this is only a keyboard diagnosis and on a new clutch should havwe been bedding it in not giving it welly imho

[deanflowers]

This is my fear and i only rebuilt it 3K ago, He did say it was just as he came onto boost so would make sense.

I was thinking it may of done a tip but will take a look at the boost guage later. Its not idling too bad but as soon as you show it any rev its missing like hell. I will also check the fault codes.

This is where some smart ass says why didnt you put a clutch at the same time as the motor.

[Joeh]

Thats called Limp Mode.

Reset the ECU by disconnecting the battery and holding the brake pedal down to drain any existing power. Then reconnect. Have a try again.... let me know how it goes... if not pull the codes from diag.

[deanflowers]

Ive experienced limp mode before and this is definately different. In limp mode it wont rev past 2.5 or 3K but this does and is missing. During limp mode isnt the rev still smooth. I will try it though later tonight.

[BlitzBoy]

like whats been said before sounds like you have done a tip, giving it WOT on a low fuel tank is a no no with these cars.
Double check the vacuum hose to the MAP sensor is connected and not split

[deanflowers]

I checked the hose was connected to the map sensor last night although i didnt check it wasnt split. Will check this tonight also.

Ive found out how to check if its a tip so will try this and go from there.

I wasnt driving it and i think this is the problem, i dont boot it on low fuel unfortunately i cant speak for other people.

[deanflowers]

Ive had another chat with the guy who was driving it and apparently the heqt light came on too at the same time, the big read one with the words heat on. This is the cat one right?

Does this shed anymore light on the situation? It had a good used Cat installed 2K ago.  

From reading previous posts does this mean that there was unburnt fuel igniting?

[rx7veilside]

does the car have an apexi ecu or standard ecu..the heat light is also used to detect knock on the apexi..not sure on a standard ecu..i think u def may have lost a tip or cracked it

[deanflowers]

Its a standard ECU running non-sequential with exhaust and filter. Was a job to tell what it was boosting to due to the clutch being completely shot so was given explicit instructions not to boost it past 0.9 bar, these instructions were also relayed to the person who was driving it.

I\'m thinking there is a common theme here of tip.

[Kash_]

I\'m sorry but if my mate came to me saying that happened to my car with him driving I would be seriously p***ed off and be asking him to cough up the cost of what unfortunately looks like a rebuild

[Ricco_04]

And as said few posts above, with a brand new clutch should have been bedding it in & not giving it some!

[interloper393]

feel for you man but the nob who hammered your car should get the bill.. is the engine still under warrenty tho?