Del
South East
Posts: 1,448
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Sept 23, 2014 18:45:47 GMT
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The Granada (2.0i DOHC 8v) has developed an annoying habit of occasionally refusing to idle when started. Under normal circumstances, it idles at 900-1000rpm but at these times, it sort of idles at about 600 for a second or so and then dies. It's been serviced and the plugs and HT leads have just been changed, but I've also noticed the battery light doesn't always go out immediately. Revving to 1500rpm-ish for a minute or so (if I catch it in time) tends to resolve either issue, although it does sound like it's only running on three until it settles down, but this is obviously not ideal. There also seems to be no pattern to the problem, it can happen whether the engine's warm or cold. Sorry to ask so many questions about this car, but it's pretty much the most modern one I've had  |
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Last Edit: Oct 8, 2014 18:49:38 GMT by Del
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Sept 23, 2014 18:49:18 GMT
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Clean out the airflow meter, switchs etc with carb cleaner ?
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bortaf
Posted a lot
Posts: 4,549
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Sept 23, 2014 20:37:01 GMT
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They don't have AFMs they run MAP sensors  90% of the time its the idle control valve, it's on the pipe from the air filter box to the inlet above the rad, 2X 10mm nuts and a plug to remove it, soak it in cleaner then add some light oil (not a lot !) and re-assemble, that should cure it but it wont make it run on 3 so maybe remove the cap and clean the rotor and contacts as well ? |
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R.I.P photobucket
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breng
Part of things
Posts: 223
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Sept 23, 2014 22:51:55 GMT
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Throttle potentiometer?
Weakness on granada's moreso the V6 though.
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Sept 25, 2014 16:56:42 GMT
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+1 for the ISCV. Probably gunged up like Bortaf says.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Del
South East
Posts: 1,448
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Would the ISCV also make it 'over-rev'? When motorway cruising, I generally sit at 65mph, which is 2600rpm. However, over the last week, it will often rev at 3400rpm to maintain the same speed, for no apparent reason. This occurs whether I've got my foot on the gas, or using cruise control.
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bortaf
Posted a lot
Posts: 4,549
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NO TBH that sounds like an autobox issue.
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R.I.P photobucket
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mk2cossie
Club Retro Rides Member
Posts: 2,954 
Club RR Member Number: 77
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Would the ISCV also make it 'over-rev'? When motorway cruising, I generally sit at 65mph, which is 2600rpm. However, over the last week, it will often rev at 3400rpm to maintain the same speed, for no apparent reason. This occurs whether I've got my foot on the gas, or using cruise control. the idle problem sounds like the ISCV as stated above, this problem sounds like the VSS on the autobox being iffy  When it does the revs problem when driving, see if the cruise control or the instant economy reading works |
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Del
South East
Posts: 1,448
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They both seem to be fine.
As a test, on the (empty) M40, I switched off the cruise when it was revving normally (2600rpm) at 65mph, and drove with my foot on the pedal. After a few minutes, it started to over-rev again (up to 3400rpm), so I came off the gas, slowed down to about 50mph, then accelerated again up to 65mph, and it revved back up to 3400rpm. Switching the cruise on, it stayed at 3400rpm.
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Granadaman72
Part of things
I likes Granada's, Cortina's, Sierra's, Viva's, Marina's....................
Posts: 483
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It would be worthwhile checking the TPS as well, mine used to play up on my dohc, usually hanging on to the revs instead of dropping back with the throttle closed. One thing i found with the last auto one i had was at about 50-55 ish it was forever changing between 3rd and 4th (overdrive?) under light throttle with a obvious change in revs. If you are also having other odd electrical faults it could be the common fusebox issue these cars suffer from, although it sounds like most of your problems are engine and gearbox related. Definitely start with the ISCV and check the autobox level and colour  |
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bortaf
Posted a lot
Posts: 4,549
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Would the ISCV also make it 'over-rev'? When motorway cruising, I generally sit at 65mph, which is 2600rpm. However, over the last week, it will often rev at 3400rpm to maintain the same speed, for no apparent reason. This occurs whether I've got my foot on the gas, or using cruise control. the idle problem sounds like the ISCV as stated above, this problem sounds like the VSS on the autobox being iffy When it does the revs problem when driving, see if the cruise control or the instant economy reading works If it was the VSS the speedo would alter not the revs, for the revs to go up the box muxt be dropping a gear (most likely dropping out of top into 3rd) ? |
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R.I.P photobucket
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Del
South East
Posts: 1,448
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If it was the VSS the speedo would alter not the revs, for the revs to go up the box muxt be dropping a gear (most likely dropping out of top into 3rd) ? Just been to see a local gearbox specialist, and that's what they reckon. Had a quick look and sniff at the transmission fluid, which shows that the 'box is slipping. Now they reckon £850+VAT for a rebuild Anyone in the gearbox rebuilding business in East London? Off-topic, but checking back through the old MoTs, the car had done just under 10,000 miles over four years before I bought it. I've done that in eighteen months, and I think the poor old fella isn't used to working this hard. |
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Del
South East
Posts: 1,448
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cresad
Part of things
Posts: 51
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Hi ,
The Granada auto box's have always been weak , I had to have my last granny's box rebuilt - 2 wks. later some toe-rag pinched it and torched it. Have you tried on the Granada and scorpio site ? for answers ? There is supposed to be some adjustment on the band in the box , it all depends on how bad it is and how far gone.
Adam
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1978 Toyota Cressida - Restored and Modified - now sold
1977 Toyota Cressida Grande Hardtop - Still working on it - now sold
1972 Toyota CROWN - Full restoration , Modified engine and auto/box - now sold
1972 Toyota CROWN - Restored , Pick up Conversion
1993 Ford Granada Cosworth 3.0 24v
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mk2cossie
Club Retro Rides Member
Posts: 2,954
Club RR Member Number: 77
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the idle problem sounds like the ISCV as stated above, this problem sounds like the VSS on the autobox being iffy When it does the revs problem when driving, see if the cruise control or the instant economy reading works If it was the VSS the speedo would alter not the revs, for the revs to go up the box muxt be dropping a gear (most likely dropping out of top into 3rd) ? Ah, yes thats true. Forgot that the normal versions have the speedo driven electronically instead of cable like the 24v  In that case, it could be the solenoid wiring to the box breaking up. Or even a soggy gearbox mount causing the linkage to snag and select 3 on the box instead of D (had that happen in mine, so know that happens ) As for the boxes being weak, rubbish! Mines lasted a few retro cars track days at Brands, runs up several of the drag strips and all on over 100k miles before it was fitted in to my car  |
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90% of the time its the idle control valve, it's on the pipe from the air filter box to the inlet above the rad, 2X 10mm nuts and a plug to remove it, soak it in cleaner then add some light oil (not a lot !) and re-assemble, that should cure it but it wont make it run on 3 so maybe remove the cap and clean the rotor and contacts as well ? 
