Question about 1997 Saab 900

1 Answer

Top end knocking noise

I'm thinking about buying a very cheap 900 2.0 8v non-turbo that has a regular knock (one second intervals at tick over). The motor has done 145k miles and runs on LPG and this is a UK car.

I'm guessing that this is a stuck lifter, snapped valve spring or damaged valve or cam lobe rather than chain or sprocket damage.

How can I more accurately diagnose without removing the cylinder head and how tricky is it to fit new lifters to both banks? Thanks for any advice you can give guys.

Posted by on

  • Anonymous Aug 07, 2008

    i have top end knocking only when i accelerate..

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 124 Answers

Try doing a compression test to see if all cylinders have same reading.
If compression is low on 1 cyl, that is obviously where to start.
Check the valve clearances to that cylinder.
If valves not set too tight, then it must be piston related.

Posted on Aug 11, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why has it started knocking?


Knocking is pretty non descript as there are a lot of noises that are associated with an engine. A true knock is a very bad sign. However there are other noises that can be confused for knocking. One way to tell is the location of the knock. High or low on the engine. If it is high then it is not as serious and is usually associated with the valve train. Low knocking is the crank and pistons. Ticking sounds are more common and can be something as simple as wear on lifters etc.

Jan 29, 2016 | Cars & Trucks

1 Answer

Audi noise when starting only


Walk away from it. Unless your getting it dirt cheap. Tapping is top end, Head job. Not cheap. Knocking is bottom end. replace the engine.

Jan 16, 2015 | Audi Cars & Trucks

2 Answers

97 grand marquis engine makes a knocking noise


have the timing checked if its off it could be pre-ignition which some people describe as a knock. if its a heavy knocking noise it could be a piston noise or it may even be a bad crankshaft/connecting rod/bearing. have the oil pressure checked this may help to know what to do. some people describe a rocker noise as a knock but its more like a ticking noise at the top end in the area of the valve covers.

Sep 11, 2014 | 1997 Mercury Grand Marquis

2 Answers

I have a 2003 Chevy Impala. I ran my car with no oil and now I'm hearing a loud ticking/knocking noise coming from under my valve cover. I added 2 bottles of oil after finding out that I didnt have any...


might be the valves have been damaged running without oil
- or the crankshaft / camshaft / main bearings
most probably you have to let the engine be rebuilt by a mechanic
(expect cost of more than US$ 2.000)
or get another (used) engine at a scrapyard 2003-chevy-wutfveiel3ypko01ydor435x-5-0.jpg 2003-chevy-wutfveiel3ypko01ydor435x-5-2.jpg

Sep 14, 2010 | 2003 Chevrolet Impala

2 Answers

MY 6L V8 makes a loud knocking noise only when it first starts for only about 30 seconds then you never hear any more knocking for the rest of the day Is this a valve problem?


In some oil filters they have anti drain back valves in them, what keeps oil in the filter when sitting for a long time. this helps get oil to ur top end quicker. If not i takes longer to get oil to ur rocker arms so you might hear a knocking or ticking for a while. Try when u do ur next oil change to get a filter it a anti drain back valve and that should help make that noise go away quicker.

Nov 17, 2009 | 2004 GMC Sierra 2500

2 Answers

How do I repair valve lash on a 2001 ford


it is possible lifters noise or rokers change oil and use thiker oil and see if noise get less

Nov 02, 2009 | 2001 Ford Expedition

1 Answer

1996 bmw 323i m52b25 slight knocking noise from engine between


take rubber hose and place near ear use as stethoscope, pin point noise, and pull apart, till problem is located. buy manual

Sep 12, 2009 | 1994 BMW 3 Series

2 Answers

MAKING NOISE AT CENTER OF TOP ENGINE UNDER MANIFOLD LOUD NOISE


Is it a ticking or knocking noise? or does it sound like something is leaking could be a bad manifold gasket which would be better than a ticking or knocking.

Jul 08, 2009 | 2005 Jaguar XJ-Series

1 Answer

Toyota supra turbo ran low on oil it locked up for a second


the chances are you have done the shell bearings on the cranck shat in or the big ends if it is a loud knocking noise or possibly the turbo (is their any smoke from engine bluey in colour if this is so engine has been damaged it could also be the camshaft too without hearing it it could be anything )hope i have helped you

Apr 01, 2009 | 1987 Toyota Supra

2 Answers

Engine knocking on a 1995 mitsubishi montero


I use 6 to 6.5 litres in my 2800 (non-turbo) engine. Six litres is safe.

The loud noise: Careful please. I have had a big-end (the bottom of a connecting rod) come off while driving - Of course you loose one cyllinder's power and the noise is very bad. Also damages the crank shaft. If the noise does not go away by adjusting the oil level, have the engine checked immediately.

Sep 15, 2008 | 1995 Mitsubishi Montero

Not finding what you are looking for?
1997 Saab 900 Logo

Related Topics:

254 people viewed this question

Ask a Question

Usually answered in minutes!

Top Saab Experts

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

yadayada
yadayada

Level 3 Expert

61037 Answers

rgbypoet

Level 2 Expert

161 Answers

Are you a Saab Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...