drove car to local garage on trade plates to check emissions before sva. 2.0l blacktop, griffin plenum,standard throttle body, cat off 1.4 fiesta. narrow band lambda,standard injectors, megasquirt. map sensor
running standard zetec base map , car drives very well and pulls etc no flat spots and revs cleanly. when tested running way to rich. leaned the mixture by altering the engine constants fuel required in megasquirt and managed to meet the co levels but unable to get a cat reading as the engine was getting to hot and machine registered insufficient flow of gas. do i need to alter the fuel table to try and rectify problem, anybody any ideas or alternative map to try. i am sure it wont pass sva as it is. Do i need a wideband lamda sensor to be able to set up to meet emissions?tuning of the megasquirt is all new to me and i could do with some help as SVA is in 2 weeks. Is there anywhere i can take the car to someone who is able to set up for me

Is a 1.4 Cat enough for 2.0 may it be restricting the flow?
Just a thought.

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Originally posted by tim windmill
drove car to local garage on trade plates to check emissions before sva. 2.0l blacktop, griffin plenum,standard throttle body, cat off 1.4 fiesta. narrow band lambda,standard injectors, megasquirt. map sensor
running standard zetec base map , car drives very well and pulls etc no flat spots and revs cleanly. when tested running way to rich. leaned the mixture by altering the engine constants fuel required in megasquirt and managed to meet the co levels but unable to get a cat reading as the engine was getting to hot and machine registered insufficient flow of gas. do i need to alter the fuel table to try and rectify problem, anybody any ideas or alternative map to try. i am sure it wont pass sva as it is. Do i need a wideband lamda sensor to be able to set up to meet emissions?tuning of the megasquirt is all new to me and i could do with some help as SVA is in 2 weeks. Is there anywhere i can take the car to someone who is able to set up for me

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Any idea what ignition timeing your running?

Is that just a Generic basemap or is that a properly setup Zetec ignition map as part of the "standard Zetec base map" you've got loaded.

If the igintion timing is a way out that could be making it run hot and also affecting the emissions.

I've no idea what you need to get a CAT reading, but a Wideband Would be alot better for tuneing with.

When we had a slight misfire with a set of damaged plugs the Lambda readings were very strange, I think they always read rich even after halfing the Req_fuel! so ignition timing etc and have a strange effect on this, I think there is also a situation where being massively rich appears to be lean.. or visa versa.

the ignition table that i am using is not the generic zetec base ignition table so maybe this could be the problem, when i said it was running hot the headers were cherry red, i thought they were going to melt, back to the drawing board to try and source another map

Is it an igintion map that somebodys given you for a Zetec or just one thats available to make it run?.

The one i've got for the Pinto that came with the MS was like
10 Deg 500-1,000 rpm
13 Deg 1,000-1500 rpm
Something like that and so on etc.

You could vary quite a bit either side of these and the car was still quite drivable if you wasn't pushing it too hard and just testing.

It might be an idea to try and find purely a timing map for a Zetec to either copy manually (from a DTA, OMEX Emerald or even standard Dizzy curve) or import into MegaSquirt.

I told you to fit a pinto

Sorry Tim
will you be home on saturday or football
Graham

there are website wich have free available maps for zetec engines.

cherry red is very very bad! think about your valves!!

to lean generates this.
but retarding the sparks also generates this.

rich on fuel can cool things down.. so maybe its a combination of the 2..

TKs