Megasquirt Another No Start
09-07-09, 10:05 PM
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Another No Start
Ok I smoothed out the ve table and started getting to boost 5-7 psi. Was looking and feeling better and better. Then here is wheat happened.
Injector staging basickly stopped, then several times I count not connect to controller. Followed by a sudden change in afr. I looked at megasquirt battery voltage reading and it said 12.9-13.0. Looked low to me. I had a friend comming with a spare fd and s5 alt so he loaned them to me since he was coming. I swapped out the alts to the s5 and started it got 14.7 volts approx at times it said 15volts. Worried me that the regulator might be out.But I drove it anyway around the block. Ran fine except the staged injection, I came back and turned it off got my stuff and hopped in to leave and it would not restart. I tried changing msq files and still nothing. I swapped back to old alternator (my fd alt) Still nothing so untill it starts I cant tell you if the original had good output voltage or not. I did not get any resets since I messed with the alternators. Only thing I know to do is to redo the msq all together like reflash megasquirt code and reinstall megatune. I think thats is.Oh and I have bad alt whine, I never had before megasquirt or moved my battery.
If anyone has a good idea throw it out there.Thanks
PS seems like its not getting fuel
Injector staging basickly stopped, then several times I count not connect to controller. Followed by a sudden change in afr. I looked at megasquirt battery voltage reading and it said 12.9-13.0. Looked low to me. I had a friend comming with a spare fd and s5 alt so he loaned them to me since he was coming. I swapped out the alts to the s5 and started it got 14.7 volts approx at times it said 15volts. Worried me that the regulator might be out.But I drove it anyway around the block. Ran fine except the staged injection, I came back and turned it off got my stuff and hopped in to leave and it would not restart. I tried changing msq files and still nothing. I swapped back to old alternator (my fd alt) Still nothing so untill it starts I cant tell you if the original had good output voltage or not. I did not get any resets since I messed with the alternators. Only thing I know to do is to redo the msq all together like reflash megasquirt code and reinstall megatune. I think thats is.Oh and I have bad alt whine, I never had before megasquirt or moved my battery.
If anyone has a good idea throw it out there.Thanks
PS seems like its not getting fuel
09-08-09, 09:01 AM
#3
MegaSquirt Mod
sounds like the 12v wiring on your secondary injectors is bad, you fried the MS internals for driving the secondaries, or there is some other problem causing the secondaries not to work.
I would verify that they're actually working.
Ken
I would verify that they're actually working.
Ken
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09-10-09, 11:33 AM
#9
MegaSquirt Mod
What kind of injectors are you using?
The flyback circuit should be fine if you're using high-impedance secondaries. Even with low impedance it should be fine if it's set up properly.
Ken
The flyback circuit should be fine if you're using high-impedance secondaries. Even with low impedance it should be fine if it's set up properly.
Ken
09-10-09, 12:26 PM
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all low imp primaries and secondaries denso720cc primaries and bosch 1680cc secondaries. I was thinking for peace of mind adding resistors to all the injectors. So things should be fine if they are clicking?
09-10-09, 12:48 PM
#11
MegaSquirt Mod
If they're clicking but you're having trouble once you stage, either your flyback circuits are messed up, or the PWM settings for the secondaries are wrong.
If you're going to get resistors (get pretty low resistance ones) then you can just put them on and not worry about the PWM settings. Otherwise you'll need to read the megamanual for tuning the PWM parameters, and get those set up properly.
Ken
If you're going to get resistors (get pretty low resistance ones) then you can just put them on and not worry about the PWM settings. Otherwise you'll need to read the megamanual for tuning the PWM parameters, and get those set up properly.
Ken
09-10-09, 08:18 PM
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10ohm resistors the big heat resistant ones. So the injectors can click and the flyback circuit can still be bad? I had set up the pwm setting per mega manual for low imp injectors same for primary and secondary, and never had a problem with primaries till now. I cant start the car still so staging is still in question, but until it starts again ima keep looking.
09-10-09, 09:50 PM
#13
MegaSquirt Mod
If the injectors are clicking, the problem is unlikely to be anything MS related. Did you double check that you're getting spark? Is the fuel pump turning on?
10 ohm resistors are probably way too high resistance. You probably want something more like 3-5 ohms.
Ken
10 ohm resistors are probably way too high resistance. You probably want something more like 3-5 ohms.
Ken
09-17-09, 09:52 PM
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OK so here is what I been able to find out.
1. fuel injector signal with a noid light looks good and injectors clicked with the output testmode.
2. spark verified with a inline spark test light
3.fuel pump works
4 fuel pressure goes crazy when cranking(set at sixty its high but still jumps to 60 then cranking goes down to 20psi and back over and over)
5. fuel pump relay clicks like crazy when cranking(never noticed before)
6.jumped power direct to fuel pump and tried to start but still did not start
7 Car tries to start but don't
Think im going to try to make a fresh msq from scratch and see what happens.Anyone else have a suggestion?
1. fuel injector signal with a noid light looks good and injectors clicked with the output testmode.
2. spark verified with a inline spark test light
3.fuel pump works
4 fuel pressure goes crazy when cranking(set at sixty its high but still jumps to 60 then cranking goes down to 20psi and back over and over)
5. fuel pump relay clicks like crazy when cranking(never noticed before)
6.jumped power direct to fuel pump and tried to start but still did not start
7 Car tries to start but don't
Think im going to try to make a fresh msq from scratch and see what happens.Anyone else have a suggestion?
09-19-09, 09:42 AM
#19
MegaSquirt Mod
Ok I do not know what most use with a half bridge for timing on crank. If I were you I would go lower an higher and see if it helps.
With stock ports, 0 degrees works well, and if I go as high as 5 or as low as -9 it will no longer start.
Ken
With stock ports, 0 degrees works well, and if I go as high as 5 or as low as -9 it will no longer start.
Ken