Triumphrat

guyver1

Yes the title is right EJECTION

I have a 2002 Speed Four, that overnight has developed a fault, where it is ejecting about 30 miles worth of fuel per tank out of the exhaust

Its been to 2 main dealers who both said its number 3 cylinder with the valves not closing

I stripped and rebuilt the engine and found zero problems with the valves
I put new plugs in and checked the coils all of which are fine

Ive just ordered a replacement IACV as mine has definately packed in as the insides have fell apart

I know the IACV controls the choke and wondered if this was the cause, but the bike runs as sweet as anything, no high revving, no hunting for fuel or anything

anyone got any more ideas what could cause it??

Will

I don't know what else it could be, but if the bike runs fine, I doubt it's the IACV. But, if you didn't find anything else wrong, I guess maybe it could be.

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Will
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BombFactory

I can't see how anyone would have thought the problem was valves. If there was something drastically wrong with the cams and/or springs to keep the valves open to use that much fuel, the piston would have had a hole blown in it long before you noticed a decrease in MPG. Also, the engine would run like absolute junk, backfiring out the intake and having no compression in that cylinder.

As Will said, if the engine idles and runs great, I can't see how it would be the IACV.

Have you checked to see that there aren't injectors sticking open? What did the old plugs look like, and what did the pistons and combustion chambers in the head look like?

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pete2

I think I'm having a similar problem. The bike runs fine, but the fuel consumption is appalling. Haven't had the head off, but the plugs are black-ish. Sometimes when starting it fouls a plug. It seems to be running really rich, judging by the smell of gasoline at the exhaust. I had a dyno tunder PC map, which I adjusted quite a bit leaner, but it didn't change a lot. Now I've bought a professional quality AFR meter, I'll have to install it and see what it says.

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guyver1

Cheers for replies everyone

quick update

I bought an OBD reader as my car through up a fault the other night, I took a chance and tried it on the bike

I got 3 codes which all pointed to the IACV
I fitted a new one just, and bike is running fine and idles a lot better, the faults are now cleared

so IACV was a certain problem part

The head was spotless on all valve openings and the valves were all fine too except 1 of them which had a minute black spot on it which came off when i reground all the valves

the valve gaps were all within tolerance, some high some low, but nothing to really moan about, the bike still stinks of fuel and exhaust fumes are wet and black

NO oil loss and NO coolant loss

I have no more dealers i can trust to look at my bike so im stuck

can the throttle bodies go out much on there own??

themaster

Is the temp sensor reading something sensible? They can get shorted out and read either very high or very low, the latter making it run rich and lumpy.

guyver1

temp is fine mate

Will

OK, I suspect a mapping issue now. It's not a huge deal, since you are riding a Speed 4 and there just aren't too many maps for them. The California air injection map seems to work pretty well for a whole lot of people. Once you have a map you like loaded, then start lowering the fuel idle trim. There's a balance on these machines between leaning it out to the point it's a PITA to ride and having it puke fuel all the time. Since you had a screwed up IACV, the chances your fuel idle trim is all screwed up is about 100%. I'm assuming you have TuneEdit with all this. If you don't then you'll have a trip to the dealer ahead of you, and they SHOULD adjust the CO properly. Another thing which will waste a whole lot of fuel is throttle bodies out of synch. So there's another adjustment which you probably are in need of. Beats me why the inside of your motor wasn't all carboned up. For what it's worth, my TT600 would get less than 20 miles per US gallon at the track, so if you are really whipping it, you'll see lousy fuel mileage even if it's perfect.

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Will
It's a squid thing. You wouldn't understand.
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Go soothingly on the grease mud, as there lurks the skid demon.

guyver1

only 1 map in the UK for the speed four, and thats bang on

tuneEdit i've not heard of before, but ive just ordered a dealertool (www.dealertool.co.uk) and that runs a check on pretty much everything on the bike, and tells you in a nice laptop display about your throttle bodies

if there out, the MOT is due next week so ill get them to adjust them for me then

Ive got a sneaky feeling the valve clearances are out

guyver1

quick update

Ive checked the valve claearances and found that 9 out of 16 were out

mostly by a tiny amount, but did find 2 that were out by .5 and .7 which is a hell of a lot

ordered new shims and will get them fitted, then try the Dealertool to see how the throttle bodies are

I feel I'm getting close now LOL