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?


Chris Johnson
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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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DARK STAR
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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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Chris Johnson
RSSOC 1979> Rhubarb SE6a V8 1979-1997 Dark Star Coupé 1989> Scimitar France 2010> Vert Soleil GTC 2014-2018
Scimitar France Website No1 on Google, updated nearly every day

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