Big missfire on my v6

[cheffy34]

I throw this one open to the experts cos it now bagged me off, some of you will remember i had a heat light prob which was solved with a new sensor last week been back on fuel consumption and running fine, the orig sensor arose i can only guess after hitting a massive amount of standing water causing a missfire which i can only assume sent a load of raw fuel down the exhaust and burnt out the sensor well guess what same bloody thing happened again tonight went down on three cylinders after a large puddle heat light on stalled, goosed not flippin happy after prodding around taking off the dizzy cap, it has taken on loads of water sitting in the lower half of the cap nocking out middle cylinder on driver side and 2 outer cyliders on passenger side, managed to get some wd40 in it, prob solved up and running again but the damn heat light is back on what do you experts reckon reset ecu or you reckon the sensor is goosed again I know what i'm gonna do but what do you guys think why does the cap take water when big puddles are hit, could it poss be cracked cap can i seal it help me out you frendly mechanic peeps


Dar


ps the damn sensor cost 90 odd squids not inpressed if i have to get another one

[bigdaddycain]

I'm VERY surprized the dizzy took on water like that, i'm even more surprized that it isn't electronic injection! I always assumed that the v6 had leccy injection... (i know what they say about assumption)...

Sellophane bag with holes for the leads, tape the holes up afterwards. Treat the dizzy/air filter as you would were you to jetwash the engine....

[kawasaki kid]

Along the lines of what Ste was saying when I used to protect the coils on my motorbikes I used clingfilm and sprayed the bodies first with WD40 to repell any water - this should work on your dizzy - just make sure you seal up any holes - has any other V6 owner suffered from this problem.

[bigdaddycain]

Ooh, this is taking me back... I used to use a spray on seal on one of my capri's..... Now what was it called?....

[cheffy34]

thanks guys not much fun yes the old rubber glove came to mind




ANYONE HAVE SIX FINGERS

I can live with the damp prob the sensor has rite peeved me tho:roll: but as you say kinda took me back the last car's that had me dabbling with damp probs was me mini's But you can't beat it for grin factor when the unsuspecting boy racer tries to chop you up why couldn't the japs just progress it to a manual v6

[bigdaddycain]

ANYONE HAVE SIX FINGERS

Only if i chop off four of mine!

There is a notion niggling at the back of my mind telling me that sudden heat change, i.e. drenching a hot lambda probe in cold water, can in fact kill it...

Is it located on the manifold, or the downpipe? Are you sure that any heat shields/splash guards are in place?

[kawasaki kid]

Ste , Would it not be some where a bit further along the exhaust where the downpipes join ie a collector box as being a V6 you have two manifolds and downpipes and Cheffy is only talking about one sensor - makes sense though if it is further down the system it may be more prone to deep water / puddles soaking it ? As you say is there a shield missing if not it may be it needs to be protected by one or to stop driving through deep puddles.

[bigdaddycain]

Aye, you are probably right there Ian, mid silencer is a fair bet...

[cheffy34]

Cat pipe guys, lambda is pre cat, heat sensor in the cat, as i recently learnt the heat sensor also adjusts mixture and yes sudden cold quenching can goose the sensors, the water appears to come up thru the scav fan area in direct line with the distributer, no shrouds seem to be missing i can only assume it bad design

[cheffy34]

I think it's more likely that the amount of raw fuel dumped down the exhaust has burnt the sensor out again What do our mechanic friends say

Over to the experts please

[mikeonb4c]

Just been hearing on the news about v heavy rainfalls down your way. Was it a very big puddle, that sent up lots of water? That kind of scenario will need more than spray on stuff for protection/sealing of components, as that stuff can split along join lines and let water in (I was alway having to re-treat my old cars etc. The glingfilm / placcy bag approach sound the better one.

I melted my spotlight relay after driving through one too many big puddles (fast) for fun last summer and filling it with water. I seem to think the Bongo is indestructible - must mend my ways

[scanner]

Thank you for this thread, it has reminded me why I gave up on petrol engines 20 years ago.

[dandywarhol]

I'm VERY surprized the dizzy took on water like that, i'm even more surprized that it isn't electronic injection! I always assumed that the v6 had leccy injection... (i know what they say about assumption)...

Sellophane bag with holes for the leads, tape the holes up afterwards. Treat the dizzy/air filter as you would were you to jetwash the engine....

Don't understand this bit of wisdom Ste - they do have multipoint injection but still need something to distribute a spark to ignite the fuel........................

[bongosailor]

I'm VERY surprized the dizzy took on water like that, i'm even more surprized that it isn't electronic injection! I always assumed that the v6 had leccy injection... (i know what they say about assumption)...

Sellophane bag with holes for the leads, tape the holes up afterwards. Treat the dizzy/air filter as you would were you to jetwash the engine....

Don't understand this bit of wisdom Ste - they do have multipoint injection but still need something to distribute a spark to ignite the fuel........................

I think bigdaddycain means "Distributerless Ignition", i.e. 1 coil per 2 cylinders, or later cars 1 coil per spark plug (No damp problems).

[cheffy34]

ANYONE HAVE SIX FINGERS

Only if i chop off four of mine!

There is a notion niggling at the back of my mind telling me that sudden heat change, i.e. drenching a hot lambda probe in cold water, can in fact kill it...

Is it located on the manifold, or the downpipe? Are you sure that any heat shields/splash guards are in place?

Could always use the spare four for some new style valve caps BDC