Ugg10
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| posted on 1/1/18 at 11:03 PM |
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Obvious question, do you have any inlet manifold or any vacuum hoses that have leaks ? If you can get it to idle and then squirt round some wd40 to
see if it changes the revs. Also, is it all cylinders that are running lean or just one, have you pulled the plugs to check? Have you tried scaling
the injector map on the eco, the map may have been set up for injectors with a higher flow rate?
Sorry obvious questions but sometimes worth asking?
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1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com
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ch1ef
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| posted on 1/1/18 at 11:16 PM |
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I've not changed anything since it was working fine, so I am trying to find the problem without adjusting the ECU etc (also because I dont want
to learn how to use megasquirt myself)
It is on individual throttle bodies, so no inlet leak issues
All plugs are the same colour, which are strangely blacker than I would think for the level of lean, but it backfires like it very lean and also the
wideband seems accurate, so probably oil or historic coke
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big_wasa
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| posted on 2/1/18 at 07:40 AM |
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That's a sign of air leaks.
Look at exhaust as well as inlet.
Lambda says it's lean so it dumps loads of fuel in.
Check to see if the oil is high or smells of fuel as you will get bore wash and contaminate the oil if it sticks in to much fuel.
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ch1ef
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| posted on 2/1/18 at 08:41 AM |
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The car does not run a lambda, and being ITB's no MAF either, so I doesn't have anything that "adjusts" the fuel like that?
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jeffw
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| posted on 2/1/18 at 10:07 AM |
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ITBs can easily leak air into the system after the butterflys. Typically this will show up as a very high idle and taking a long time to return to
idle after being blipped.
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ch1ef
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| posted on 2/1/18 at 10:16 AM |
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That is not the case for my car, I had to raise the idle so it wont stall
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ch1ef
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| posted on 8/1/18 at 07:32 PM |
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One last set of checks before I take it to a garage;
tested OK;
TPS sensor
Cam timing
Crank sensor
Swapped over plugs,coil and leads from my working car
Compression tested even results around 140psi
Injectors fire in order and with good patern and even across them all
Water temp works
Air intake temp is showing high, but was like this when the car worked fine so assume its how the ECU was tuned (Bought a new sensor and it was the
same)
Megasquirt ECU all wired correctly and no broken wires
Fuel pump/regulator holds a constant pressure
Battery is showing 14v when running
Checked earths and messed around with them and doesn't change anything
Only things that I can observe being strange are;
AFR is showing very lean 19+ but the spark plugs are black and it smells rich (so I have read that it burning badly can in fact show as lean when it
is infact very rich as combustion is that bad?)
Cylinder 4 at part throttle will almost rhythmically backfire out the inlet trumpet (same happens on two ignition systems), but all other cylinders
seem to not backfire which seems strange.
Any ideas of last things to check or investigate before I give up on what I can achieve with it?
PS thanks for all help so far
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SJ
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| posted on 9/1/18 at 08:27 AM |
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quote:
AFR is showing very lean 19+ but the spark plugs are black and it smells rich (so I have read that it burning badly can in fact show as lean when it
is infact very rich as combustion is that bad?)
Seems more likely that the ecu thinks the mixture is lean hence the 19 AFR, and so is trying to fix that by richening it up, hence the black plugs.
Could it be an air leak on the exhaust manifold or maybe the AFR sensor is failing?
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ch1ef
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| posted on 9/1/18 at 09:05 AM |
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Thanks for the suggestion, but the ecu has no afr attached, so it is fixed Mao in that respect
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daviep
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| posted on 9/1/18 at 09:19 AM |
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Do you have MAP sensor? If so is the reading sensible?
Is the reading from the TPS sensible?
Cheers
Davie
“A truly great library contains something in it to offend everyone.”
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ch1ef
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| posted on 9/1/18 at 09:24 AM |
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No map sensor, and yes tps looks smooth and moves full range on tunerstudio.
It is running throttle position sensot, crank position sensor, air intake temp, coolant temp and I think that's it for sensors
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Schrodinger
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| posted on 9/1/18 at 12:54 PM |
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How have you got the AFR if you have no AFR sensor?
Keith
Aviemore
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ch1ef
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| posted on 9/1/18 at 01:04 PM |
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The car was already tuned, and has no narrowband 02 for adjusting the mixture. I am running a wideband standalone to try and fund the issue
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BaileyPerformance
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| posted on 9/1/18 at 02:27 PM |
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quote:
Originally posted by big_wasa
Bailey Performance
Thank you :-)
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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BaileyPerformance
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| posted on 9/1/18 at 02:28 PM |
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quote:
Originally posted by jossey
As above take a trip up to Bailey. Best decision I ever made
Thank you :-)
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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