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Hick-up On Tickover

2251 Views 56 Replies 8 Participants Last post by  xxxxxxxxxxxxxxxxxFinn
Hi guys,

Another question for you all.

On tickover, I have noticed that the engine hesitates, has a hick-up but this is not evident whilst driving. (sounds like 'hunting' but not continuous)
I've changed the plugs and the fault is still there and my next test will be to change my fuel. I have heard that the fuel supplied by Tesco is not up to scratch, which is in the tank at the mo. Anyone else found this symptom :roll:

I hope it's nothing to do with the DI

Would a fuel filter change help?


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Thanks Chris,

Will it have to be removed to clean it out?
Ok. Used 1/4 can of injection/air intake spray cleaner and sure, it has cleaned all the insides.

The erratic idle seems only to occur when the aircon compressor is in action and seems to want to stall, once/twice a minute. With the air con off, all seems fine. I know the compressor takes quite a bit of power from the engine but thought it shouldn't cause this hick-up.

A bit off putting when I'm at the lights. Switch of air con or hover over the auto gear shift and get ready for a re start :confused:
Yes it is Chris. Especially when next to an idiot in an Audi or BMW;oops: I'll get it looked at when next in for a service in 2k miles.

Thanks a bunch to all.

Cheers, Phil.
Chris 9-5 said:
Yep, and with an auto you cant exactly drop the clutch and restart on the roll either :roll:

Where did you get the carb/throttle cleaner from by the way?

I got it from my local car spares shop. It's called 'Wynn's Fuel Injection Intake & Carb Cleaner' Methanol based and by god, it really cleans the intake out. I had to put mu sun glasses on after:cool: Cost was about £4.50 but worth every penny, even if it did not cure the problem.

A quick note as well guys. I had to replace the large 'O' ring around the air intake which seals the delivery pipe to the throttle body. Perrished like a tarts gussett:eek:
Hi Chris,

No. It is still spluttering in the heat with the aircon on. Now I switch to 'econ' when at the lights :(
Sure is Chris. I'll still have a tinker and report back if anything works.

Widows, it should be thown out of one:evil:

Well guys, most strange:roll:

The splutter has seemed to have dissapeared, now that I've filled up with 99 RON (90.4 pence a litre) fuel supplied by Tesco and had a blast down the M20 today. This is a higher octane fuel they are now supplying which I think may be because of the higher tuned car on the market today.
This is with the aircon on full blast too and the engine is purring like a kiten;)

I'll give it some time, and some town driving to see if the fuel was a problem, but I may still get the compressor clutch checked out on my next service.


Good idea Chris. At least that may sort out if the fuel quality is in question, causing these annoying glitches.

I'll see how this tank full of 99 RON performs in London and report back.


'Super' something but the figure 99ron shouted messages to me. I'll have a look this week.:confused:

I do not think this stuttering problem is fuel or a/c compressor clutch now. Driving in London traffic today, she coughed and stalled at the lights. I switched the heater controls all OFF, then 30mins later, crossing Oxford St, stalled at the lights, at idle. Mmm;oops:

Me thinks I'll have to elliminate all the possibilities before heading to the garage again, if its to do with the electronics, but I'm sure it's not the new plugs, well, you never know!

It's getting to me now together with the heat:evil:

The new plugs, which are 14 days old are Bosch FR5DP222 and gapped at 1.0mm (Haynes recommended) Perhaps I should do another change. Which do you recommend?

So, Ron had not got to you Tescos yet:lol: I'll speak to my filling station and see what the delay is! :p
I'll give it a go. Cheers.

I'll report back tomorrow, splutter free I hope:confused:
Finn said:
Phil use these:

NGK Spark Plug 9-5 1998 on NGK BCPR7ES-11

Really cheap as well, gapped to 1.1 if I remember correctly. Someone confirm please..
Shouldn't they be BCPR6ES-11 for an untuned up 2.3t, or are these just a hotter version?
Finn said:
Isnt the Tesco rocket fuel only available at big outlets like Lakeside, whilst they market test it, or someting silly like that..:x
I'll find out Finn from my local one at Brookfield Farm (Cheshunt) to see what is going on, the next time I fill up. They normally have a leaflet about all the fuels they retail, so I'll get one and do a write up.

Mmm. Might have the throttle body off and give it a thorough clean out. Probably full of oil sludge after 100k miles.

Hi Guys,

Well, I had the throttle body off yesterday which was a quick job and the following found.

1. Throttle cable 10mm out of adjustment
2. On removal of the throttle body, copious oil was present, very thin and brown in colour. There is a little reservoir moulded into the intake manifold approx 12mm x 12mm which was full of the gunk, and it was present all around the mounting flange too.
3. Cleaned all that off and had a look inside the intake manifold. About 1 tablespoon of the same dirty oil was sitting inside:eek: That's not right I'm sure. With a lint free cloth, I mop'd this up as best I could as it is a little restrictive.
4. Cleaned the throttle body and inspected the 'P' shaped gasket for splits but it seems Ok, but I have one on order as it is a little flat and hard.
5. All together now and took it for a 20 mile run last night, a/c on, and guess what, NO SPLUTTERING:p (New plugs not fitted yet)

Before I get too enthusiastic, I'll run it for a few days too see how it performs and replace the throttle body to intake gasket when it arrives, as I guess seapage is ocurring.

I'll take some pictures (2nd time around) and send them to Finn (hope you do not mind) so that he can post them. I'll add notes to indicate the findings 1st time round.

It'll be interesting to see if the oil has re appeared in a day when I change the 'P' rubber/gasket.

Anyone else found this on their car????

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Throttle body 'P' rubber gasket fitted, new NGK 7ES-11 plugs fitted (they perform great guys, thanks) and had a chat with a Saab engineer.

His conclusion is that the solenoid in the throttle body is on the way out as the splutter at idle is intermittent, and not caused by the a/c clutch. Admitted, the engine revs will fall when the clutch cuts in, but would not cause the surges that I have... 3 or 4 times in 15 seconds, he says.:confused:

I will consider what to do next, but now the engine has sprung an oil leak. The timing chain tensioner was replaced yesterday, where oil was seaping, and today, still oil on the drive.

It's back in the garage now where the engine is going to be removed for a complete re seal.....

What a week:evil:

Why are Saabs so complicated? Are their aircraft prone to such failures!!!!! No wonder we do not see many flying today!!!

I'll let you know the damage later in the week:x

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Now that I have got up from the floor, I'll give you the details of the garage visit:x

1. Remove Engine £500
2. Additional reseal labour £300
3. Balance chain kit £175
4. Timing chain kit £175
5. Head skim + crank test £75
6. Head/Engine reseal kit £105
7. New oil & filter Free Ha Ha:roll:

All plus VAT

Mind you, the engine is as quiet as a mouse, but at great expense and no sign of the spluttering at idle. Mind you I have not been on a run yet!

All this work was done by my local garage who specialise in saab & volvo, not a dealer.

Time for a large drink I think, that's if I can find some loose change in the car:cry: :evil: :evil: :evil:
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