1985-1998 [Subscribe to Daily Digest] |
 | [Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: 93' 9000 runs one day won't the next Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 16 Jan 2009 06:33:38
In Reply to: 93' 9000 runs one day won't the next, randy F., Thu, 15 Jan 2009 16:14:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I assume the engine cranks just fine, it just doesn't catch. Once the engine starts, it runs fine.
When it cranks, does it sound like it's even trying to catch? Or just cranking?
Simple test- every time, before you start the car, turn the key to ON position for about two seconds. Look for the warning lights to come on - oil pressure, ABS, etc. After a two count, turn the key to Start, and keep watching the lights.
The lights should all come on brightly with the key ON, and should stay on somewhat (some flicker is normal) when cranking.
If you don't see the lights come on, or stay on (dimly) while cranking, I'll bet the engine doesn't start. If you can correlate no dash lights to no starts, replace the ignition switch.
The other advantage of this trick, other than letting you see if any bulbs are burned out, is that the fuel pump will run for a couple of seconds, building up some fuel pressure. If the pressure is low when you go to start, the fuel doesn't spray out in fine droplets, it dribbles out in big drops. Big drops don't burn well. Once the pressure builds up, now the cylinder mixture may be too rich.
How fast does the engine crank? Slowly or fast? Have you done a compression test? Low compression makes for hard starts. Slow cranking makes it hard to build up pressure.
Any other information on when it doesn't start? Only when the car is warm? Only when cold, only the first start of the day? How does the car run once it does start?
Any other information? Is this a turbo or non-turbo? Manual or automatic? Are they the right NGK plugs, properly gapped? How do the plugs look?
Put a voltmeter on the fuel pump fuse - most fuses have a little cutout on the back where you can stick a meter lead. Check the voltage while you're cranking the engine. If you see 12 volts, then you know voltage is getting to the fuel pump. It may not be running, but voltage is getting there. If you don't see 12 volts when cranking, then it may be fuel pump relay, LH module, or CPS. Yes, I know you changed it.
posted by 192.249....
, Fri, 16 Jan 2009 06:33:38 <-- Viewing This Message
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
