Re: Ignition Switch Test followup - Saab 900 Bulletin Board - Saabnet.com
[General |
Members |
C900 |
9000 |
NG900 & OG93 |
93 |
95 |
NG95 |
99 |
Sonett |
Vintage Models |
Performance |
Detail |
Clubs & SOC |
Other Cars |
FAQs |
Gifts |
Member Photo Galleries |
Member Directory |
Classifieds |
Service/Mechs |
Manuals |
*Buddy Registry |
*Mileage Registry |
Polls |
What's New |
Raffle |
Photo of the Month |
Sponsors]
Have you done compression and leakdown tests? Those help rule out mechanical problems.
Are you losing any coolant? Water in the cylinders give long crank times.
When it cranks for a long time, does it run rough or smoothly when it catches?
The fuel pressure gauge rules fuel out- it's an excellent test that few use.
I'd start by assuming it's electrical, since it's intermittent:
figure out a way to confirm primary ignition current. It can be tricky
because it's higher than 12v. Ideally, what you want is a light that blinks every
time the coil fires.
Put the same sort of light on the injectors. They call them 'noid' lights.
One is probably enough. Same idea as the coil.
You'll get a baseline idea of how things blink when the car starts normally,
so that when it doesn't, you can tell what's different.
The problem is that there are quite a few variables, from the rather likely
(e.g.bad primary coil wire, bad connection to the ECT sensor)
to the expensive (ecu) to the truly unusual (distributor timing sensor)
so ruling out entire systems is by far the easiest way to solve this
cheaply and quickly.
hth,
t
_______________________________________
what do you mean, the engine's in backwards?
Posts in this Thread:
Post a Followup
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.
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Poverty2Prosperity.org
Your address is: 3.239.236.140 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!
(#2653) [Profile/Gallery]
(more from TRacer) on Tue, 23 Jun 2020 09:43:31
, Mon, 8 Jun 2020 08:38:03
1
