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1996 Cielo misses & cuts out at idle

My 1996 Cielo drove fine in the morning; 3 hours later it had a major miss and would not idle; it stalls if the revs are allowed to drop (it does not stall or miss at high revs).

Have replaced plugs, plug leads, distributor cap, rotor, coil lead (all were needing replacement on inspection).

Timing firing on mark and advancing as revs increased.

Petrol pump pumps for about 5 seconds after stalling. Petrol filter is clear.

I have checked delivery from the pump by pumping into a bottle & flow is steady before injectors and after injectors on return line.

I have put 2 bottles of injector cleaner into petrol tank (1/4 full) and run engine at medium revs (above missing speed) for half an hour. Each injector now causes similar delayed drop in revs when power lead to injector removed with engine running.

Petrol pump pressure regulating valve holds vacuum - no petrol in hose on vacuum side.

Throttle body dismantled & decarboned (it was dirty).

Air intake valve on throttle body moves out when ignition turned on.

Car starts first time when cold but if allowed to drop back to idle it stalls and then winds over slowly with little indication it wants to start. Wait 5 minutes and it will wind over quickly & start again first time, without missing at high revs, but stall at idle speed as before.

The rough idle occurs at start up and once the engine has run at medium revs to get engine to running temperature.

Battery has been charged over night and tests OK.

No engine warning lights illuminated on dash.

As car won't idle I can't even drive it to a mechanic to get the codes tested....

Thanks for any help you can offer

Posted by on

  • iceman_ryde Jan 28, 2009

    I have had some progress; a compression test showed cylinders 1,2 & 4 went up to 175psi with all plugs removed & throttle fully opened. However number 3 cylinder pumped up to only 155psi then dropped rapidly to about 20psi even though the engine was still turning over. 3 squirts of oil down the cylinder ruled out ring problems, so I'm hoping it's a pumped up valve lifter. The valve train is quiet when running.

    A bottle of Nulon engine oil flush and running at fast idle for 1 1/2 hours seems to have cleared the problem, normal idle has been restored, and the engine restarts without trouble if turned off, so hopefully this is problem solved.......



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