Back-firing when starting

[wrinx]

If it is a problem with the coil, might it be possible that the HV generated by the coil is not being contained within the coilpack and causing the other spurious errors?

Have you been getting more than the usual static shocks from the car?

I guess anything's possible, if the cars' not running right it'll be giving lots of dodgy readings...no electric shocks yet though

wrinx

[Steve Webb]

Easy access We must be looking at different cars

Well maybe if you've dropped the subframe first.

[wrinx]

Easy access We must be looking at different cars

Thanks for the information though, very helpful.

wrinx

Just re-read your post and realised you're talking about a V6

wrinx

[Suzumushi]

Just re-read your post and realised you're talking about a V6

wrinx

That's why access is easy it hit's your eyes when you open the hood


regards

[Juan AR155Q4]

Try turning the camhsaft sensor "case", as I remember, you´re not with the std cams.
And the cam sensor position, has to be in a certain window.

[wrinx]

You're correct, I've got a C&B inlet cam, but the car backfired and was difficult to start before this was fitted.

wrinx

[Juan AR155Q4]

Anyway, try with the cam sensor case. May be it was rotated before.

[wrinx]

Don't think so, it looks to be lined up in the correct position but I guess a play might be worthwhile

wrinx

[Q4-Dave]

Were all your problems solved regarding this or still the same?

I have this issue now on one of my cars, have checked all cables and wiring, new spark-plugs, measured and checked the leads.

Still back-firing when starting and more likely starts when I stop cranking..?

grateful for any tips or info regarding this..

[wrinx]

Still the same on mine but I have other problems to solve before I can confirm anything.

These include coil packs and the aforementioned wiring.

wrinx

[the wombat]

Starting just as it stops cranking, and popping and banging on start up sounds like the discussion we had a couple of months ago on dodgy cam sensors.

I think I mentioned I changed the plug on mine as it had bad connections.

Symptoms sound like they were similar.

[Q4-Dave]

Starting just as it stops cranking, and popping and banging on start up sounds like the discussion we had a couple of months ago on dodgy cam sensors.

I think I mentioned I changed the plug on mine as it had bad connections.

Symptoms sound like they were similar.

Yes I have read your previous discussion thoroughly.

I have rebuilt this engine myself during the summer, before it started just perfect but was leaking oil (hence the rebuild) when in parts everything was of course cleaned that was oily but this sensor was not one of the oily or dirty bits, so no excessive cleaning with though chemicals or anything was used on that one..

I have also changed to my other cars cam-phase sensor (which runs and starts very well but as it is my summer car sits in the garage for the moment) and the problem still exists I don´t see that the sensor is the problem

all the connections look fine and the cables as well, the spark plugs are new leads worked fine before the rebuild and the engine runs smooth and fine after the popping and banging (and I stop cranking) starts her up.

Getting desperate as I need to rely on this car and I suppose the battery will take it´s toll after a while from all the cranking? anything else that may take damage of this?

[Q4-Dave]

Hello guys, I am afraid I have stuck on this problem still..

Need your help now!!
I start from the beginning, due to many oil leaks and finally a blown headgasket I completely (standard-)rebuilt my engine this summer with new gaskets and sealing all the way, new piston rings and bearings, completely renovated head (by a enginerebuild-company, not by me), renovated the injectors with new filters and so on (by a company who does these things, not myself), new sparkplugs (BP6ET, are these right/Ok?) you get the point no expenses spared, altough keeping it standard as I intend to use it as my daily driver. now to the problem:

After the rebuild the car backfired when try to start and started when I stopped the cranking in the beginning, I have doublechecked all connections and cables that I can think of, exchanged the camshaft-phase-sensor, tried with the crank-position-sensor tried with the starter motor, tried changing the ignition module and the ignition-coil packs and nothing has even made a difference, I have doublechecked the cambelt fitting

Now I am left with 2 non-working cars, the black one is stripped to take parts from to try on the red one to get it running, as the other one anyway stands in the garage during winter no biggie..

I have also left the car in desperation to a local "Alfa-specialist" (that actually knew what car this is, he runs a dyno-shop with usual customers ferraris and lamborghini and many alfa) to adjust the timing and look at the start-problem, he did the same tests as I have done and three weeks later he calls me and says he won´t continue as he is overbooked and I have to come and get the car, when I come to get it he says "that´ll be 1100 EUR", the car still wont start and it is exactly the same as when I left it there, although I now have new earth/ground cables between the battery and the chassis and engine to chassis as he thought it could be "earth/ground-problems"..

my wallet are now much lighter but the same problems still and have escalated into now not starting at all with the ignitionkey, runs well if you tow it and put in gear (don´t know the english word, jumpstart? no thats with cables)..

the car is fitted with an immobilizer system, can this be causing the problems somehow, during the dis-/reassembly the chassis only stood outside my work, nothing changed there.

another info is before the rebuild the immo-system could come off during a drive and the red indication light came on and a long (2min) beep could be heard and sometimes shut down and sometime left on until I parked the car and then stopped a minute after stop, but the car could also die during running and then be a bit cranky to get started again but not backfiring like now.

any ideas would be greatly appreciated

[Q4-Dave]

Solved the back-firing issues I have had for some time now, It all was the hole way a "broken" misfiring ignition lead for the 3rd cylinder.. You would think that a workshop that charge you 1100 Euro would have already checked those =P

now all is well

Merry Christmas to you all..

[wrinx]

You would think that a workshop that charge you 1100 Euro would have already checked those =P

You would indeed, have you thought about complaining?

wrinx

[Steve Webb]

Shocking behavior from a so called specialist

I've just read through all that David, its pretty despicable behaviour from a specialist who supposedly knows what they are doing.

I suppose they have charged you for the time of one of their mechanics, but if I ran the company I wouldn't have the gall to charge a customer that much if I hadn't fixed the problem.

I guess you won't be going back there again will you.