Guys my car is running fine, and ticks over nicely.
When the TPS (Mikuni R1 Carbs)is connected to the MJ unit i get a missfire when i bring the revs up, if i put the TPS trigger (pin 9) down to earth it clears.
How can i set up the Tps setting or what should i be adjusting.
Thanks Spence
Missfire
Moderators: JeffC, rdoherty, stieg, brentp
This might help
Two different steps:
A) Click Get Config. Go to general tab and select the number of cylinders you have. Click Update Config. Check for misfire. (When you start a new map tuners will default to either 4 or 8 cylinders, always set this value)
OR
B) Click Get Config. Save your map if you haven't done so yet. Then make a new one, which has 10 degress in all of it's timing bins, somewhat proper RPM and MAP ranges. Then go to General tab in the tuner and select the number of cylinders you have. Click Update Config. Rev your engine again, see if it misfires.
If you done A and it cured the misfire, then you had incorrect number of cylinders.
If you done B and it cured the misfire, then your ignition map was too advanced.
If none of this helps then it's something else, such as the VRS sensor position in relation to TDC. If you happen to live in Florida let me know.
A) Click Get Config. Go to general tab and select the number of cylinders you have. Click Update Config. Check for misfire. (When you start a new map tuners will default to either 4 or 8 cylinders, always set this value)
OR
B) Click Get Config. Save your map if you haven't done so yet. Then make a new one, which has 10 degress in all of it's timing bins, somewhat proper RPM and MAP ranges. Then go to General tab in the tuner and select the number of cylinders you have. Click Update Config. Rev your engine again, see if it misfires.
If you done A and it cured the misfire, then you had incorrect number of cylinders.
If you done B and it cured the misfire, then your ignition map was too advanced.
If none of this helps then it's something else, such as the VRS sensor position in relation to TDC. If you happen to live in Florida let me know.
It could be an install
It could be an install problem, or a map/configuration problem. Here's some thoughts about potential install problems...
Misfires have been attributed by some people to earthing problems around the EDIS installation, but it's unlikely here as you say it works fine with the TPS (MJLJ pin 9) grounded.
Does it run perfectly (ie not mis-fire at all) at any rpm, with pin 9 grounded?
It's always worth checking the earthing anyway..
- At the EDIS module:
...VR and PIP/SAW shields to EDIS pin 7 only (the tails on your EDIS connector should do this)
...EDIS pin 9 to ground
- At the MJLJ unit:
... Gnd (pin
to ground
... do not connect the PIP/SAW shield to anything, but minimise the length of the unshielded PIP and SAW cores to the MJLJ connector.
Are you sure the TPS is OK - is it brand new? They do have failure modes where the resistance doesn't change smoothly and the TPS value is 'all over the place' causing massive jumps around the ignition map which could appear to be a misfire.
You should also do some basic checks on the TPS voltages with the engine not running...
- at closed throttle, MJLJ pin 9 should be close to 0v (0v-1.5v is OK)
- at wide open throttle, MJLJ pin 9 should be close to 5v (3.5v-5v is OK)
- when moving the throttle from closed to open slowly, the voltage should rise gently (ie not jump around)
Do you see these?
To calibrate the TPS bins on the map, look at
http://www.cate1.co.uk/megajolt/installation.php and
http://www.cate1.co.uk/megajolt/mapping.php
Do some more checks, report back....
Misfires have been attributed by some people to earthing problems around the EDIS installation, but it's unlikely here as you say it works fine with the TPS (MJLJ pin 9) grounded.
Does it run perfectly (ie not mis-fire at all) at any rpm, with pin 9 grounded?
It's always worth checking the earthing anyway..
- At the EDIS module:
...VR and PIP/SAW shields to EDIS pin 7 only (the tails on your EDIS connector should do this)
...EDIS pin 9 to ground
- At the MJLJ unit:
... Gnd (pin
to ground... do not connect the PIP/SAW shield to anything, but minimise the length of the unshielded PIP and SAW cores to the MJLJ connector.
Are you sure the TPS is OK - is it brand new? They do have failure modes where the resistance doesn't change smoothly and the TPS value is 'all over the place' causing massive jumps around the ignition map which could appear to be a misfire.
You should also do some basic checks on the TPS voltages with the engine not running...
- at closed throttle, MJLJ pin 9 should be close to 0v (0v-1.5v is OK)
- at wide open throttle, MJLJ pin 9 should be close to 5v (3.5v-5v is OK)
- when moving the throttle from closed to open slowly, the voltage should rise gently (ie not jump around)
Do you see these?
To calibrate the TPS bins on the map, look at
http://www.cate1.co.uk/megajolt/installation.php and
http://www.cate1.co.uk/megajolt/mapping.php
Do some more checks, report back....
Cheers guys, ill get the
Cheers guys, ill get the multi meter out over the weekend and have a look see what i find.
Thanks Spencer
Thanks Spencer
Hi Guys - Right here goes.
Hi Guys - Right here goes. Ive spent all day in the garage armed with my multi meter.
I sorted out the TPS problem, now I know how to test it; earth and trigger round the wrong way. All Sorted
Another problem I noticed is i get no advance when i bring the revs up (slowly or a blip) Its at a static 10o
I found, i have a problem with my loom, when i move the loom about the revs change and it misfires or spits back through my carbs, move it again and it’s fine and revs nicely.
So I’ve made a complete new loom, resoldered and heatshrunk everything now TPS works fine but still no advance.
I took the pc into the garage (wife gave me a dirty look) looked at the Runtime Display – not really sure what im looking at. I got my min and max values 13 – 158.
It’s definitely set to 4 cylinders and TP
Ps im in london england, wouldn't mind being in florida though
I sorted out the TPS problem, now I know how to test it; earth and trigger round the wrong way. All Sorted
Another problem I noticed is i get no advance when i bring the revs up (slowly or a blip) Its at a static 10o
I found, i have a problem with my loom, when i move the loom about the revs change and it misfires or spits back through my carbs, move it again and it’s fine and revs nicely.
So I’ve made a complete new loom, resoldered and heatshrunk everything now TPS works fine but still no advance.
I took the pc into the garage (wife gave me a dirty look) looked at the Runtime Display – not really sure what im looking at. I got my min and max values 13 – 158.
It’s definitely set to 4 cylinders and TP
Ps im in london england, wouldn't mind being in florida though
Sounds like you're running
Sounds like you're running on EDIS alone and the MJLJ isn't doing anything except reporting the TPS values - which is a good thing in itself (shows some stuff is working) so we've just got to fix the rest...
Can you see this TPS range with the engine off, but the MJLJ powered up? If so, that's good.
When the engine is running, does the run time display give you any RPM values...?
....if yes, then that shows the PIP signal is getting to the MJLJ and the SAW signal probably isn't getting back to the EDIS
....if no, then that shows the PIP signal probably isn't getting to the MJLJ
There's some more tests you can do with your multimeter...disconnect the connector to the coilpack (so the engine doesn't start) and try these with all other connectors in place...
PIP Pulse
Test:
Measure at EDIS pin 1 and MJLJ pin 2:
- should be battery volts DC stationary
- should be around half battery volts DC when cranking
Demonstrates: A working VR sensor and a probably working EDIS module with regard to generating PIP pulses
SAW Pulse
Test:
Measure at MJLJ pin 5 and EDIS pin 3:
- 0 volts AC stationary
- 0 volts DC stationary
- typically 0.14 volts AC cranking
- typically 0.06 volts DC cranking
Demonstrates: A working VR sensor, a probably working EDIS module with regard to generating PIP pulses and a probably working MJLJ with regard to producing SAW pulses
Report back again....I suspect you're close to success...
Can you see this TPS range with the engine off, but the MJLJ powered up? If so, that's good.
When the engine is running, does the run time display give you any RPM values...?
....if yes, then that shows the PIP signal is getting to the MJLJ and the SAW signal probably isn't getting back to the EDIS
....if no, then that shows the PIP signal probably isn't getting to the MJLJ
There's some more tests you can do with your multimeter...disconnect the connector to the coilpack (so the engine doesn't start) and try these with all other connectors in place...
PIP Pulse
Test:
Measure at EDIS pin 1 and MJLJ pin 2:
- should be battery volts DC stationary
- should be around half battery volts DC when cranking
Demonstrates: A working VR sensor and a probably working EDIS module with regard to generating PIP pulses
SAW Pulse
Test:
Measure at MJLJ pin 5 and EDIS pin 3:
- 0 volts AC stationary
- 0 volts DC stationary
- typically 0.14 volts AC cranking
- typically 0.06 volts DC cranking
Demonstrates: A working VR sensor, a probably working EDIS module with regard to generating PIP pulses and a probably working MJLJ with regard to producing SAW pulses
Report back again....I suspect you're close to success...