Hesitation at low revs

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DARK STAR
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Hesitation at low revs

Post by DARK STAR » Wed Oct 30, 2019 10:03 pm

This is on the boss's Opel Calibra, which is our 'new' car (only 28 years old) but needs maintenance even so :mrgreen:

It has developed some hesitation when accelerating from low revs, either hard or gently (had to try gently just to see).
I thought spark plugs which are pretty ancient, or perhaps a vacuum problem as the hoses are looking rather crackly.
What do the brains think?

In France everything is done by numbers and Opel kindly print the part number on everything so I Googled GM 90 354 693
And it doesn't look anything like the hose on our car.
The shape is not too convoluted so I thought of using a length of reinforced fuel hose, is this a good idea?


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Hesitation at low revs

Post by Old and Slow » Thu Oct 31, 2019 7:35 pm

Perhaps it might be better to use some old fuel pipe if you any - that's already hardened - to minimise the likelihood of it collapsing with the vacuum?
Must be worth a try, anyway, don't you think?


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Hesitation at low revs

Post by old bean » Thu Oct 31, 2019 11:43 pm

DARK STAR wrote:
Wed Oct 30, 2019 10:03 pm
our 'new' car (only 28 years old) but needs maintenance. What do the brains think?
Give it some and service the engine, HT system incuded.



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Hesitation at low revs

Post by DARK STAR » Fri Nov 01, 2019 6:08 am

It does get routine maintenance, and has only done 40 000 km in 20 years ...
So you think new plugs would be a good idea, and perhaps plug leads ?

I duly fitted the petrol hose in place of the cracked vacuum pipes and there is a noticeable difference already.
I will see if I can get some proper vacuum hose from the motor factors.
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Hesitation at low revs

Post by DARK STAR » Wed Nov 20, 2019 3:25 pm

New plugs have cured the problem.
The old ones are a good colour - except for some strange black marks around the electrode on one.
But they look a bit eroded.
As you may notice, they have no brand name, and are stamped 'Made in China'
This is because I had the silly idea of having the car serviced by an Opel dealer a few years ago.
Mind you, they have done pretty well.
The new ones are Bosch and are stamped 'Made in Russia' :shock:

I failed to find a plug lead set on internet, I was wondering if I could make up a normal set or if the aluminium tube thingies are important ...
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Hesitation at low revs

Post by philhoward » Wed Nov 20, 2019 3:42 pm

The tubes are heat shields to stop the leads degrading from heat. Materials for leads (from the likes of Magnecor etc) might be better nowadays? The alternative is make a set up, reusing the tubes?


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Hesitation at low revs

Post by efi_sprintgte » Wed Nov 20, 2019 5:18 pm

Loads of Vauxhall’s/Opel’s from that era used that 8v cam driven dizzy lump. Maybe worth looking up another vehicle of the same age with the same engine? Id be amazed to find there’s no HT leads available for that engine.


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Hesitation at low revs

Post by philhoward » Wed Nov 20, 2019 5:30 pm

A quick google found these: https://www.ebay.co.uk/itm/Ignition-Cab ... 3696943298 which gives you a Bosch number and also some Opel numbers to check with - do they look the same?

I looked for an Astra GTE Mk2 2.0 8v which I think is the same engine?


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Hesitation at low revs

Post by DARK STAR » Wed Nov 20, 2019 6:21 pm

Good thinking Phil ... but apparently not.
I'll have a go with the other Opel models (a Calibra is a Vectra which was fairly common)
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Hesitation at low revs

Post by philhoward » Wed Nov 20, 2019 6:25 pm

I don’t have much faith in the eBay compatability charts personally..as they probably say there are NO leads which fit an 8v Calibra..


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Hesitation at low revs

Post by efi_sprintgte » Wed Nov 20, 2019 6:32 pm



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Hesitation at low revs

Post by DARK STAR » Wed Nov 20, 2019 6:33 pm

Ok, found it on Pièces 24, an excellent german site (in spite of its french name - it is Autodoc for the german market)
I'm pretty sure this is correct because there are only three heat shields, like the original (cheapskates)
They have them in chinese for 11 euros, I wonder where the Bosch ones come from at 25 euros 8)
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Hesitation at low revs

Post by scimjim » Wed Nov 20, 2019 6:52 pm

DARK STAR wrote:
Wed Nov 20, 2019 6:21 pm
a Calibra is a Vectra which was fairly common
Opel Vectra A in Europe - we called it the Vauxhall Cavalier.


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