SAAB V4 Forum
SAAB V4 Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 General Technical
 Cold starting issues.

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Format Mode:
Format:BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List

* Forum Code is ON
Smile [:)]Big Smile [:D]Cool [8D]Blush [:I]
Tongue [:P]Evil [):]Wink [;)]Clown [:o)]
Black Eye [B)]Eight Ball [8]Frown [:(]Shy [8)]
Shocked [:0]Angry [:(!]Dead [xx(]Sleepy [|)]
Kisses [:X]Approve [^]Disapprove [V]Question [?]

Check here to subscribe to this topic.

T O P I C    R E V I E W
andydeans3Posted - 26 Mar 2019 : 08:05:55
I've got a small issue I thought someone could help with.

In the morning, if the car has been run the day before, one pump of the throttle, turn the key, she starts fine.
If, however, she's been left in the garage for a few days, (with the battery disconnected), she becomes a real bitch to start.
Starting hot, no problem.

I have so far checked and changed the following:-

- New plugs, with gap set correctly.
- New dizzie cap
- new rotor arm

I have checked the timing, (8 degrees), the compression, (140 to 150 psi on all cylinders), and have also checked that the choke flaps are closing.

When she won't go, if I spray some "cold start" spray on the air intake, off she goes, no problem.
Spark seems good, and the battery is not old. It's a Halfords battery with one of those indicators that tells you the state of charge.
It has at times in the past helped to jump another battery in parallel. (before I bought the "cold start" spray.

Any ideas? The carb perhaps?. It's a twin choke Weber, about 3 years old.
She's running a bit weak I think, plugs are almost white. I'm wondering if this is part of the problem.........mixture needs to be rich for cold starting.
Am I correct in saying that you screw the idle jet screw out to richen the mixture?

Any input much appreciated.


1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
15   L A T E S T    R E P L I E S    (Newest First)
andydeans3Posted - 13 Apr 2019 : 20:36:10
Yep, I'm going to re-set the timing, and if it still doesn't fix it, we can have a "fiddle" on Swedish Day!

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
mellePosted - 13 Apr 2019 : 18:26:33
Originally posted by andydeans3
[...] as soon as I sprayed some "Cold Start" on the air filter, Off she went first turn. A bit "stuttery" to begin with, but then ran fine.
Must be a "fuel" problem!
This is a common and persistent misconception. I think I explained it in your thread on the other forum.

Since this is a "new" issue, I wouldn't suspect the jetting. Fix the timing first (check the dizzy clamp is tight) and then start fault finding as suggested earlier. Happy to lend a hand if you haven't fixed it by Swedish Day.
GeoffCPosted - 13 Apr 2019 : 16:06:54
Presumably as it runs ok normally the jetting is correct. Hope so as I ordered
the same from Fast Road Cars but haven't fitted the carb yet. I think an electric fuel pump would help your mechanical one may be struggling to pull fuel through when it has been standing.
andydeans3Posted - 13 Apr 2019 : 15:04:32

Not sure without going to take the Carb apart, but I took advice from this and the UKSAABS forum at the time, and was told to ask Fast Road Cars, to jet it as for a 1600 Cortina. Which I duly did.

As a follow on. Having got my MGB Roadster on the road, with its' first free tax disc, (Yipee) on the 1st of April, I've not been using the SAAB this last 10 days or so. When I went to start it yesterday. Same story. No way to start it. Plenty of winding going on, so I don't think it was fuel draining back from the carb. However, as soon as I sprayed some "Cold Start" on the air filter, Off she went first turn. A bit "stuttery" to begin with, but then ran fine.
Must be a "fuel" problem!
Hoping to sell the MGB, so need to get this sorted out!

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
72sonett3Posted - 09 Apr 2019 : 10:28:21
You have a Weber 32/36 DG*V carb? What is the jetting?
It has one mixture adjustment screw (to set CO at idle) and 2 idle jets, see e.g.

If you have a compressor, blow out the idle jets with compressed air.

Ignition should be at 6 deg BTDC.

This is what I have in my Sonett (1700):

'72 97
'77 96L conv.
'79 96GL (LPG)
'83 900i (LPG)
'95 900SE conv.
'99 9-3T
mellePosted - 01 Apr 2019 : 19:05:24
I'm not interested in having my V4s converted to electric, the engine for me is at least half the fun. That being said, I would welcome a ban on all internal combustion engines for obvious reasons, and I would happily give up this hobby in that case (plenty other hobbies left).
andydeans3Posted - 29 Mar 2019 : 12:18:35

Not sure about the theory of the price of petrol dropping, when the electric car revolution really takes over.

The way I see it, as the "revolution" moves forward, and we reach the tipping point, when perhaps Electric cars start to cost the same as IC driven cars, and there is a great rush to electric, petrol stations will start to disappear like "snaw aff the dyke", as we say up here in the frozen North. (the "real" north, not that pretend one around Manchester, ha ha ha...). A bit like the way that bank branches are disappearing now.

As less and less people need petrol, the transportation costs per volume of fuel shipped will rise steeply. Plus the government, (Bless their cotton socks), will massively increase the tax on fuel to encourage people to switch, also to compensate for their loss of tax revenue on selling fuel.
Using today's prices I could see petrol costing 10 or 15 a litre, once the switch to electric is in full swing.

Melle. I would happily convert my 96 to fully electric, except that it currently is prohibitively expensive.

I saw a You Tube clip of a guy in Germany with a fully electric 95, but it only had a range of about 80 miles. (Might even have been 80 kms - can't exactly remember).
Lead acid batteries I think.
I know in the MG world someone converted a modern MG-F (or TF) to fully electric, and I think it cost him more than 10 000.
There is a company now producing a brand new MGB fully electric car for, wait for it.......99 000!!!!!!
(bearing in mind that given the supply of spares, including body shells, you can actually build a brand new MGB from parts.)

I have been looking at converting the 96 to GPL, which is likely to be around a lot longer than petrol, due to the it's many non automotive uses. That costs around 1000 to 1200.
My MGB, I'm going to sell shortly, (after 37 years boo hoo), once I get the Historic status for the car - it's a 1978 car.
So if you know anyone interested in buying a much loved MGB roadster - let me know.

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
mellePosted - 28 Mar 2019 : 23:11:34
I cannot wait to have my daily 900 electrified.
pchristyPosted - 28 Mar 2019 : 22:44:20
I wouldn't worry about the unavailability of petrol, Andy! I suspect that as electric takes over, petrol prices will drop due to the lack of customers for it!

My other hobby us building RC model aircraft. For years we used 35 MHz as a control frequency. Then the "Spread Spectrum" revolution occurred and everyone move to 2.4 GHz. Well, I say everyone - the canny ones stayed on 35 MHz, which is now almost deserted, but for which you can pick up equipment that would have cost hundreds of pounds for peanuts!

For every cloud there is a silver lining!

"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
andydeans3Posted - 28 Mar 2019 : 20:49:10
Aye, I bought the car in August 13 from Ron, in Kent. She'd been displayed at Wicksteed Park, at the English SAAB International.

At that time the odometer read 29 000 kms, which was in fact, of course , 129 000 kms, She's turned the clock again and is currently reading 20 000 kms, so in 9000 kms, I'll have done 100 000 kms, or 62 000 miles,in 6 years, so around 10 000 miles per annum.

For me a car is there to be used, not be taken on a trailer, to car shows. I drive her to car shows. Next one will be Swedish Day in May.
She's not perfect. She has quite a few "warts" in spite of a re-spray in 2016, but I love her.

I don't own a modern car, my "other" car is a 1978 MGB, which I've owned for more than half my life, but I hope to sell soon. (As soon as I get the historic status for it, next week).

I'm just glad that, given my age, I'll hopefully see out Internal Combustion driven cars, before the electric car revolution consigns them all to the scrapyard, due to the unavailability of petrol!!!!!

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
mellePosted - 28 Mar 2019 : 18:28:59
Andy's 96 must be one of the most frequently used ones in the UK!
pchristyPosted - 28 Mar 2019 : 18:23:00
Every V4 I've owned takes a while to start after its been left a few days. The fuel drains back down the line, and there isn't sufficient left in the bowl for a cold start. You just need to keep cranking until the fuel gets through to the carb again!

The non-return valve didn't work for me. The only cure is to fit an electric fuel pump, but that can have its own complications! I fitted a Huco suction pump in the engine compartment, but it would vapour-lock on hot days. If you fit one in the back, near the tank, its a good idea to fit an inertia cut-out in case of accidents.

Or do as I do, and use the car more often! ;-)

"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
andydeans3Posted - 27 Mar 2019 : 15:36:20
Yeah, perhaps wasn't a good idea to cross post on UKSAABS as well, but it's good to do that to get maximum coverage.


1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
mellePosted - 26 Mar 2019 : 22:36:55
Oh and don't over-tighten the carb nuts, it will only bend the base and cause air leaks.
mellePosted - 26 Mar 2019 : 22:27:29
Originally posted by andydeans3
Melle - I didn't set the timing at 8 degrees, I simply checked it, and being at 8 degree, it seemed reasonable.
You say the engine is running lean, so in theory advancing the ignition timing a few degrees would help for slightly cooler running. I'd rather fix the underlying issue though, no reason to deviate from six degrees with a standard engine I think.

Originally posted by andydeans3
Air leaks at the manifold are something I could certainly check, though I do habitually check the tightness of the carb nuts.
I meant re-torquing the manifold bolts and nuts, I've often found they were loose.

A bit confusing you cross-posted this on UKSaabs, have to read my previous posts to see what I suggested where!

Snitz Forums 2000
SAAB V4 Forum© 2000-04 Snitz CommunicationsGo To Top Of Page