hi people
i finaly start my toyota tercel whit a 4ag swap
but the engine the only way i starts is if i put throtle at 1\4 and it idiles like crap and if i take my foot of the gas it dies
i already know that the car is super rich becose i kill a set of spark plugs already
so if any one can help me whit the tunning i will apreciated much
heres a copy of a datalog i make last night and the msq file i used
i use the oem igniter and oem sensors and the setup im using is from a write up JamesL posted if that helps
car dies after foot off gas
Forum rules
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
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David Cowie
- MegaSquirt Newbie
- Posts: 3
- Joined: Wed Nov 24, 2004 8:16 pm
- Location: Australia
I'm not familiar with Msnsextra, only the standard MS and the problem may well be in areas I don't understand. But....
Looking at the datalog in MegaLogViewer, you have a highest MAP of 83 - does this match the altitude you live at? And a lowest of 69, which is a very high MAP for an engine trying to idle. If the ECU fuels for 69 kpa it won't supply an idle pulsewidth. I 'live at' 88kpa (950m above sea level), my car idles at 37kpa and medium acceleration gives around 67 kpa.
At one point yours is 71 with a TPS value of 2, at 3700 rpm. If the TPS is correctly calibrated i.e. the throttle really was almost closed at that point, then something is wrong - maybe the MAP is not getting full engine vacuum. One likely cause for this would be if it was connected at a throttle edge vacuum point such as used for distributor vacuum advance, rather than at a point that sees full manifold vacuum. Or it could be pinched, restricted or leaking. Is the MAP sensor itself O.K.? - you can put a syringe on the line and see what the MAP reading does when you push the plunger in and out.
You also have a lot of acceleration fuelling points when the TPS value is only changing by 1 point, this would also cause richness and suggests the TPS dot threshold is too low.
Good luck.
Looking at the datalog in MegaLogViewer, you have a highest MAP of 83 - does this match the altitude you live at? And a lowest of 69, which is a very high MAP for an engine trying to idle. If the ECU fuels for 69 kpa it won't supply an idle pulsewidth. I 'live at' 88kpa (950m above sea level), my car idles at 37kpa and medium acceleration gives around 67 kpa.
At one point yours is 71 with a TPS value of 2, at 3700 rpm. If the TPS is correctly calibrated i.e. the throttle really was almost closed at that point, then something is wrong - maybe the MAP is not getting full engine vacuum. One likely cause for this would be if it was connected at a throttle edge vacuum point such as used for distributor vacuum advance, rather than at a point that sees full manifold vacuum. Or it could be pinched, restricted or leaking. Is the MAP sensor itself O.K.? - you can put a syringe on the line and see what the MAP reading does when you push the plunger in and out.
You also have a lot of acceleration fuelling points when the TPS value is only changing by 1 point, this would also cause richness and suggests the TPS dot threshold is too low.
Good luck.
David
Blue Mountains
Australia
Rover SD1 3.9L V8
Blue Mountains
Australia
Rover SD1 3.9L V8
You most certainly have an intake leak or a problem with you MAP sensor setup.
A 4age unloaded should be running 25-36 kPa
There are alot of little ports in the 4age intake to deal with capping. I had about 7 unused vac. sources.
If you have a TVIS engine, dont forget the ports on the bottom that drive the TVIS valve.
A 4age unloaded should be running 25-36 kPa
There are alot of little ports in the 4age intake to deal with capping. I had about 7 unused vac. sources.
If you have a TVIS engine, dont forget the ports on the bottom that drive the TVIS valve.