Date: Tue, 27 Feb 2001 13:50:58 GMT From: "Keith Grider" <noonenopsaml.com> Subject: Re: Why a car backfire & smoke
It would be easier to diagnose if more information were given. Does it run fine just until the temp gage starts to move? Does it run bad after running 5 minutes? Does it do this after a bout of heavy acceleration. Does it do it more when it is raining or damp out? The smoke leads me to a FI problem or a vacuum problem. The backfire suggests it could also be something with the ignition (cap/wires). This is a long shot here. Verify operation of the checkvalve on the PCV nipple. There is a small diameter vacuum hose running to a plastic elbow in the valve cover. This line should have a checkvalve in it. Disconnect it at the intake manifold side and suck on the line. It should allow you to do this. Then blow on it. It should not allow you to blow through it. If it does and does not allow you to suck through it, re-orient the valve, it is installed backward. If it does not function as a checkvalve, replace it. The other long shot is the problem I had with one of mine. this is a big long shot. If you have a multimeter, check the O2 sensor lead while it is running and exhibiting this problem. It should have a DC voltage which goes slowly up and down between 0.2 and 0.7 (or so). If it reads high and does not move, it is an AMM problem. If it is high and doesn't move AND the code returned by the fuel injection computer is a lean code, it MAY be the ground connection on the head. unscrew it, wire brush all the ring connectors and the head. reassemble with a little contact grease and retighten. KeithG "Alvin Carter" <al-crtrnopsamspring.com> wrote in message news:97femj$ves$1nopsam.atl.mindspring.net... > No water in the oil. Water level is OK. I use to lose antifreeze last year > but I added a sealant to the reservoir and the antifreeze level has remain > constant for six months now. Last year I would get white smoke when the > car has been ideal for a long time but not anymore. In the morning the car > crakes up find. It runs great. Then sporadically, the engine would cut > off. It starts right back up with no problems. I do get blue smoke at the > stop light sporadically after the car backfires. > > How can I check for low compression in one or more cylinders? > > "Keith Grider" <noonenopsaml.com> wrote in message > news:1Cvm6.12672$Aj2.419313nopsamoon.columbus.rr.com... > > Knackered is British for 'worn out', 'tired', or otherwise 'damaged'. > > > > I do not know if I agree with the headgasket portion of the diagnostic. It > > MAY be knackered, but probably not. Check for normal head gasket things > > first. 1) water in the oil, 2)dropping water level with no obvious leaks, > 3) > > low compression in one or more cylinders. If it is ok, then diagnose the > FI. > > Does the 'check engine' light come on at any time? Does this happen when > it > > is raining only? Is there any other information you can give us? Does it > > start and runs fine and then this occurs sporadically or all the time? > Blue > > smoke is oil, white is antifreeze, black is fuel (rich). Does it idle > > smoothly? etc. We need more info to help. > > > > KeithG > > > > "Alvin Carter" <al-crtrnopsamspring.com> wrote in message > > news:97e022$f7m$1nopsam.atl.mindspring.net... > > > Do you have any ideals about bring the injection system back from the > > dead? > > > Also, what does knackerd means? > > > > > > "Trevor Cockayne" <rootnopsamorld.com> wrote in message > > > news:Pine.LNX.4.21.0102242148090.1602-100000nopsam.simpson... > > > > It sounds like your injection system is dead and head gasket knackerd > > > > > > > > -- > > > > Trevor Cockayne > > > > tcockaynenopsamorld.com > > > > > > > > On Sat, 24 Feb 2001, Alvin Carter wrote: > > > > > > > > > All of a sudden my 1987 SAAB 9000 Turbo is backfiring while I'm > > driving. > > > > > The car does not smoke at all but sometimes when it backfires blue > > smoke > > > > > comes out. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
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