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Topic: erratic over run (Read 830 times) |
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Torbayboy
Full Member
 
Posts: 900
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erratic over run
« on: May 30th, 2018, 11:29am » |
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Hi, 97 cos estate, on overrun the engine surges occasionally occurs above 25mph and below 55mph other times when you take your foot off the accelartor the revs just settle. Had a little of this in my 95 cos saloon but cured itself as I drove it more regularly.
Possibly a different issue is on tickover mainly when hot after 10 or so seconds the idle adjusts dow by 50+ revs and stays there, blip the accelerator and it repeats the process.
Runs fine other than this showing 27 mpg on non motorway runs and does what is asked smooth autobox changes - nice drive.
Any help or suggetions please.
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Cosworth Scorpio only 42 on the road now NOW down to 32.incl 25 ultimas
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2359
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Re: erratic over run
« Reply #1 on: May 30th, 2018, 1:22pm » |
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Check the throttle butterfly moves freely and the accelerator cable is not sticking also check for weak or corroded return springs in the linkage.
Might just need a drop of oil somewhere.
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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Simmo
Administrator
I'm an OAP !
Posts: 5508
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Re: erratic over run
« Reply #2 on: May 30th, 2018, 1:23pm » |
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Clean the MAF 
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Now I'm an OAP
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1476
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Re: erratic over run
« Reply #3 on: May 30th, 2018, 10:52pm » |
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on May 30th, 2018, 1:23pm, Simmo wrote:
I concur
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I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Torbayboy
Full Member
Posts: 900
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Re: erratic over run
« Reply #4 on: Jul 6th, 2018, 11:42am » |
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Re clean the maf, any carb cleaner (car plan stp wynns)? best to go for??
Thanks
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Cosworth Scorpio only 42 on the road now NOW down to 32.incl 25 ultimas
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Nunnspoet
Full Member
I love YaBB 1G - SP1!
Posts: 798
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Re: erratic over run
« Reply #5 on: Jul 6th, 2018, 12:09pm » |
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Hi. Go into "Servicing and Repairs, look down the left hand side of the page, click on Engine, and in the page now displayed click on the piece dealing with the MAF.
Good luck
Mike
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Torbayboy
Full Member
Posts: 900
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Re: erratic over run
« Reply #6 on: Jul 22nd, 2018, 7:22am » |
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Cleaned the MAF seems a lot better now Thanks Guys
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Cosworth Scorpio only 42 on the road now NOW down to 32.incl 25 ultimas
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