Question about Ford Escort

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1991 Ford Escort failed smog test...CO (%) MAX 1.0, measured at 1.17. How to resolve problem so it will pass smog retest?

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  • lori_pearson Sep 12, 2009

    It is a smog test done in California. The engine doesn't have a carb as it's fuel injection (1.9 L SEFI or LOHM engine). Any more thoughts?

  • lori_pearson Sep 12, 2009

    Oh and the air filter is new.

  • lori_pearson Sep 12, 2009

    It hasn't solved the problem but provided valuable information.



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Apart from the obvious ,,air filter is blocked ,now if its a 1991 then it could have a carb ,around the base of the carb is an airscrew ,find it and screw it in to reduce the petrol flow ,engine will go lumpy so increase idle to compensate.Now this setting for a carb model here in spain is 2.0 so i have a funny feeling that the inspector is being over zealous ,but if you are in california??? they are a bit paranoid their ,just spoke to another mechanic in the UK on messenger and he confirms thats its 2.0 their as well and hes of the same opinion as me and thats to find a local garage close to the inspection depot then put car into that garage and hope the mechanic is friends with the tester and he talks it through like i do when i take vehicles for a mechanical inspection here in spain.If i had a better idea of what engine you had in this escort i could ask around and come to some sort of reply ,but iam assuming its a LHD version of the british built escort in liverpool the other thing is that when i worked in fords in the early 70s on the assembly line in the engine plant we built a special version of the then Mk1 escort /ford cortina engine and it was fitted with all special valves on the inlet manifold and distributor ,beleave it was for a car called the pinto ??Anyway if has all these antipoloution controls try pulling off one of the small vacumn pipes as this will allow more air into the engine on idle reducing the CO2 .Or take it to dealer and ask them to have a look who will no doubt have an old dinasaur like me who will know what to do ??or trade it in on scrappage plan and get a good deal against a new vehicle.Best of british with your problem ----from spain

Posted on Sep 12, 2009

  • Colin Stickland
    Colin Stickland Sep 12, 2009

    Sorry cant help much here because i have never seen one of these engines ,let alone worked on one .But if i had it in front of me then i could no doubt work out whats causing the problem.Now i should imagine that something is causing it to run rich on idle ,if the CO2 levels are ok when engine is reving up then their must be a valve that opens on idle to allow more air into intake i should imagine that this valve will have two vacumn pipes running to it that balance the valve so to speak and when engine is above idle speed the vacumn drops allowing the valve to close and when it idles the increase in manifold vacumn opens the valve allowing more air into manifold reducing the CO2 .But to be totally honest without seeing it in front of me ??? This is of course assuming that the engine isnt worn ,ie-- valve seats ,piston ring wear ,bore wear ect .When emmisions are tested here a sensor is put in tailpipe and a small vac pump sucks the exhaust into a machine that measures the gas .... Honest the thing thats checked here first is the paperwork and the chassis number thats stamped on the body ,then the horn -- well this is spain and they all drive with hand on horn,,, Well its 22 15 here in spain and i have to go and pick er indoors up from work then iam banned from being on here till the morning when i can get on while shes still asleep.As stated i do apologise but i have no experiance with an old vehicle under your state emmisions laws ,Although the new cars here have the specs that you use in california as you will appreciate the cars are the same as yours ,identical ,but older cars ?? are a different kettle of fish .must dash now because if i keep her waiting iam in the doghouse



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