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Topic: Ongoing engine saga (Read 688 times) |
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tintin
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Ongoing engine saga
« on: Oct 20th, 2006, 11:00am » |
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Hi all,
Ok, idle still rough and sticking, also now down on power. Gave it to the garage, they are saying there is a nasty rattle from the n/s bank at the rear. Only happens at idle, rev, as revs drop metal-to-metal rattle and not always. They reckon hydraulic tappet, but need to strip down.
Not sure i want to go that route, and also not sure that is causing my issues. Is this a common problem? Hopefully i can get more opinions at the borders meet....
As usual, all advice much appreciated.
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'95 Cosworth Ultima
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howiedintheplace
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Based near Evesham
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Re: Ongoing engine saga
« Reply #1 on: Oct 20th, 2006, 11:09am » |
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This is something that you need to listen to yourself but my first thought is the N/S CAT breaking up & blocking? I assume it's a 24V 
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Dave
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tintin
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Re: Ongoing engine saga
« Reply #2 on: Oct 20th, 2006, 1:29pm » |
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sorry yes 24v...
CAT would sound about right, car was overfuelling until i replaced the FRPR, cat on n/s wasnt doing much pre-change, then after the O2 sensor started making curves again, so i thought i had cured it.
would a cat breaking up cause engine to hold back, and rough idle..... this could be my elusive issue (although i doubt it would cause a sticky idle)
i seem to be replacing every part of this engine trying to get it to run smooth !!
i still have my suspicions about the injector wiring.....doesnt look good in there....
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hellblue
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Ill have silver,it dries just as fast !
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Re: Ongoing engine saga
« Reply #3 on: Oct 20th, 2006, 7:16pm » |
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The CAT can become detached & rattle (bit like a golf ball in a tin can!) it can also block the outlet or part block it
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Gary
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tintin
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Re: Ongoing engine saga
« Reply #4 on: Oct 21st, 2006, 12:35pm » |
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ok, cars back from the garage, the rattle is from inside the engine, hes had a stethoscope on it and is bemused because the rattle is moving up and down the piston at the back on the n/s. He reckons 3hrs + cost of tappet (anyone know how much one is?).
Rattle is very bad when cold and low blip of revs, but goes away when driving. When warmed up, it doesnt rattle at all. Interestingly i didnt notice the hesitation/lack of power on acceleration once it warmed up any more
is it worth driving it to the borders meet for you guys to check out, or miss the meet and just let them dive in?
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scorpio_man
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Re: Ongoing engine saga
« Reply #5 on: Oct 21st, 2006, 2:27pm » |
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hi sam
if it's a dry day i'd bring it down. stuart's going with one of 4 (or is it 5 now  ) 24v's so we should be able to come up with something.
hth
btw, what about using an flushing oil, then an oil change. might be a blocked oil way. 
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mazzy_j
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Re: Ongoing engine saga
« Reply #6 on: Oct 21st, 2006, 2:29pm » |
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Sounds near enough exactly as to the niggling little problem currently with my 24v. At idle she rattles a bit from the n/s cat, but goes away when you rev the engine/driving along. When cold the idle isn't exactly perfect and sounds as though its missing, with slightly white petrol smelling smoke coming from the exhaust. Once warmed up that goes away and barely makes a sound. Another scorp related job lined up before the winter sets in.
Matt
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tintin
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Re: Ongoing engine saga
« Reply #7 on: Oct 22nd, 2006, 2:28am » |
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dead on Matt, sounds the same (although mine has become a bit of a death rattle when cold), will keep you posted...
i notice when idling at lights, when the idle stutters a puff of white smoke out the back, once warm all seems well
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'95 Cosworth Ultima
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Spannerdemon
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To me, this has all the symptoms of a single broken/damaged piston ring. The white smoke is the giveaway.
At the moment, you'd probably get away with a bottle hone, and new rings on the piston concerned.........but don't leave it.
I'll be interested to see the results of this one, but for me, it's a ring!! 
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tintin
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Re: Ongoing engine saga
« Reply #9 on: Oct 22nd, 2006, 12:18pm » |
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dont make me cry
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'95 Cosworth Ultima
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howiedintheplace
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Re: Ongoing engine saga
« Reply #10 on: Oct 22nd, 2006, 11:17pm » |
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Well things don't sound good.
I guess you gonna have to trust the garage & let them rip it apart.
Over fueling can cause bore wash that in the right conditions can cause ring problems.
If it was a tappet it should do it all the time
A broken ring might show up on a compression test.
You sure it's not a big end?
They wear fast on a 24V.
There will be a sweet spot for the rattle probably around 2000rpm, keep the engine there & listen.
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Dave
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tintin
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Re: Ongoing engine saga
« Reply #11 on: Oct 23rd, 2006, 3:58pm » |
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<sob> 
i will see what comes of the weekend, but if it can last 'til March, i can spend £££ on the engine/new one.... i just want a sweet-running motor !!
noise wasnt there at all 1 month ago, which makes me think broken something rather than worn something. soon as the engine is warm it disappears, and car runs sweet, but on cold idle it is nasty.
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'95 Cosworth Ultima
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Spannerdemon
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One of the best ways of pinpointing a mechanical noise on an engine is with a stethoscope (which your garage has tried). You can get these from Ebay "AUTOMOTIVE MECHANICS STETHOSCOPE" is what you need to type in. They're not dear, and are a good addition to any toolbox. You might just be able to find the actual source yourself. I still think it's a piston ring.
Professional ones are VERY expensive, and to be honest, don't justify the expense. PLEASE be careful if you do buy one. Don't get it near any moving parts, belts, chains, your tie, etc, as obviously the engine has to be running for you to hear the noise.
Good luck with it.
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