Date: 21 Aug 2003 10:36:55 -0700
From: alancemornopsamo.com (Lance Morgan)
Subject: Re: Engine trouble on a 94 900


> > 'nuther Bob wrote: "Jon Ingall" <jingallnopsam.ca> wrote in message news:<vk9jk2bp7sh1ednopsam.supernews.com>... > I admitted defeat and took it to the shop. Cylinder number 3 has 50psi of > compression, 1,2 and 4 have 150 psi. > > Currently, a bad valve is being blamed. Any other thoughts? Is this more > likely than a cracked head or burned piston? The head gasket got replaced > about a year or so ago, so it shouldn't be the culprit. > > > Lance Morgan <alancemornopsamo.com> wrote in message > news:2a52f3e9.0308202123.585a7e5dnopsaming.google.com... > > "Jon Ingall" <jingallnopsam.ca> wrote in message > news:<vk5gomqd53tm51nopsam.supernews.com>... > > > I hope someone can help me out on this one: > > > > > > I've got a '94 900 turbo which is idling very poorly, lacks power and > > > occasionally is hard to start. This just started today after the rush > hour > > > drive home. > > > > > > The number three cylinder didn't seem to be firing, so I popped in a new > set > > > of platinum plugs, which reduced the problem but did not eliminate it. > I > > > was thinking of a new distributor cap and rotor, but I don't know how to > > > check if the existing one is shot. > > > > > > Here's what has been done recently (to eliminate some guesses): new fuel > > > pump, new head gasket, turbo dump valve. > > > > > > My next guesses would be a pcv valve or fuel injectors. I would really > > > appreciate any guesses which might be more accurate than these. I'm new > to > > > this car and it's quirks. > > > > > > Thanks for your help. > > > > > > Jon > > > '97 Z28 > > > '94 900 Turbo Rag Top > > > On 20 Aug 2003 22:23:18 -0700, alancemornopsamo.com (Lance Morgan) > wrote: > >>> '94 900 Turbo Rag Top >> >>Is this a Classic/Old Gen or New Generation 900? > > > He posted that answer in advance above :-) > > Bob > > PS. If it's a 94 Rag Top it's a classic. Thanks, Bob. I knew the c900 ran thru 94 w/CV, and it makes sense that no NG900 CV was offerred for that MY Jon - those look like dry comp numbers. Shop should also provide you w/wet comp #s, and possibly progress to a leak-down test Another tip I've heard, but haven't used first-hand, is to position piston #3 so all valves are closed. Then run compressed air into cylinder, and listen for the "escape avenue": exhaust pipe ---> bad exhaust valve; induction system components ---> bad intake valve: oil filler cap ---> bad rings (should also be picked up on wet comp test)

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