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Microtech backfiring and hard/no start

Old 01-11-09, 05:06 PM
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backfiring and hard/no start

i have this problem that the car backfires on cranking and really loud to my ears are still ringing. if the car dose start then it seems like it is running on only one rotor then it stars running on 2 rotors. here is my setup have 550/1600 and have verified that the timming is set right. have pulled the plugs and cleaned them off. they were a little wet. cleared out the motor and nothing.

Idle Map
Screen 1

30" ~ .95
25" ~ .95
20" ~ 1.14
15" ~ 1.44
10" ~ 1.71
05" ~ 1.91
00" ~ 2.14
2-20psi ~ 4.95

Load Map
Screen 3

30" ~ 0.95
25" ~ 0.95
20" ~ 1.13
15" ~ 1.44
10" ~ 1.81
05" ~ 2.24
00" ~ 2.56
2psi ~ 2.2
4psi ~ 3.4
6psi ~ 3.9
8psi ~ 4.6
10psi ~ 5.1
14psi ~ 5.7
16psi ~ 6.0
18psi ~ 6.6
20psi ~ 7.1

RPMwot Map Screen 17

5000 ~ 05
5500 ~ 08
6000 ~ 08
6500 ~ 10
7000 ~ 11
7500 ~ 11
8000 ~ 11
9000 ~ 12

The rest are zero

RPMcrs Screen 18

1000 ~ -12
1500 ~ -11
2000 ~ -12

THe rest are zero



Pump Map
Screen 19

Pump2Start ~ 2000
Pump1Amt ~ 15
Pump1Pulse ~ 04
Pump1Trig ~ 10
Pump1Stop ~ 00
Pump1Adv ~ 05

Pump2Time ~ 10
Pump2Amt ~ 30
Pump2Trig ~ 16
Pump2Stop ~ 00
Pump2Adv ~ 05

PumpDwell ~ 3.00
PumpTimers ~ No
Pump1Sync ~ No
PumpSpare ~ 00
PumpCold ~ 00

Water Map
Screen 20

-25 ~ 0
-17 ~ 70
-9 ~ 60
-01 ~ 50
05 ~ 45
11 ~ 45
18 ~ 42
24 ~ 34
31 ~ 26
38 ~ 24
46 ~ 19
60 ~ 12
68 ~ 06
82 ~ 0
99 ~ 0
124 ~ 0

Air_t Map
Screen 21

-25 ~ 0
-17 ~ 8
-9 ~ 6
-1 ~ 5
5 ~ 4
11 ~ 3
18 ~ 3
24 ~ 0
31 ~ 0
38 ~ 0
46 ~ 0
60 ~ 0
68 ~ 0
82 ~ 0
99 ~ 0
124 ~ 0

Crank Map
Screen 22

-25 ~ 72
-17 ~ 72
-9 ~ 72
-1 ~ 67
5 ~ 62
11 ~ 57
18 ~ 50
24 ~ 41
31 ~ 31
38 ~ 26
46 ~ 20
60 ~ 15
68 ~ 5
82 ~ 0
99 ~ 0
124 ~ 0

t*rpm
Screen 23

Idle ~ 00
1000 ~ 10
1500 ~ 15
2000 ~ 20
2500 ~ 25
3000 ~ 25
3500 ~ 25
4000 ~ 25
4500 ~ 25
5000 ~ 25
5500 ~ 25
6000 ~ 25
6500 ~ 25
7000 ~ 25
8000 ~ 25
9000 ~ 25

t*map Map
Screen 24

Idle ~ 00
25 ~ 05
20 ~ 04
15 ~ 03
10 ~ 02
05 ~ 00
00 ~ 00
2psi ~ 00
4psi ~ 03
6psi ~ 05
8psi ~ -07
10psi ~ -09
14psi ~ -13
16psi ~ -17
18 psi ~ -21
20 psi ~ -25

t*air Screen 25
Correction value Is expressed as number of degrees

you wish to advance or Retard to the Ignition curve

and values Is set at zero.

t*gap
Screen 26

0500 ~ 15
1000 ~ 15
1500 ~ 15
2000 ~ 14
2500 ~ 12
3000 ~ 10
3500 ~ 10
4000 ~ 10
4500 ~ 10
5000 ~ 10
5500 ~ 10
6000 ~ 10
6500 ~ 10
7000 ~ 10
8000 ~ 10

t*Inj Map
Screen 27

0500 ~ 120
1000 ~ 150
1500 ~ 150
2000 ~ 150
2500 ~ 150
3000 ~ 150
3500 ~ 150
4000 ~ 150
4500 ~ 180
5000 ~ 210
5500 ~ 210
6000 ~ 240
6500 ~ 240
7000 ~ 270
8000 ~ 270
9000 ~ 270

t*wat Map Screen 28


ANd the rest are zero

Option Map
Screen 30

Af_StE ~ 10
Dwell ~ 3.25 *set at Time Base - not at Duty Cycle*
REVstg ~ 1320
MAPstg ~ 02"
%stg ~ 50
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Old 01-12-09, 05:57 AM
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is the engine new rebuild?
probably abit low on comp.

Looking at that map it should start no dramas.

What port is it?
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Old 01-12-09, 11:46 AM
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the engine just got rebuilt 4000 miles ago with a large street port. do you think that 50% staging would have any affect on this because of the injector size difference?
thanks vince
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Old 01-12-09, 04:23 PM
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well i pulled the bonehead manover and thought that cleaning off the plugs was enough. it wasent. i put in brand new plugs and it fired right up. thanks to everyone.
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Old 01-12-09, 04:59 PM
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Cleaning plugs does not work.
People never seem to understand that. When you flood plugs. GET NEW ONES.
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Old 01-12-09, 06:02 PM
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i learned that one. fought, and fought the car over fouled plugs. it sucked
but thanks for the help rx72c
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Old 01-12-09, 06:38 PM
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Being that you are running 550/1600 your staging should be around 85% . Put a new set of plugs verify you plug wires are correct , alot of ppl have installed them in the wrong plug . if it still does it it could be a bad coil , pickup .
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Old 01-12-09, 07:32 PM
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i put in new plugs already and it started very well, but i will set the staging to 85. thanks
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Old 01-13-09, 03:30 AM
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dont set the staging to 85.

The tune above should work fine.
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Old 01-13-09, 10:48 AM
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it runs preaty good right now on the tune above with new plugs. its off to the dyno to get tuned. thanks to everyone.
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Old 01-18-09, 07:33 AM
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No worries mate. Im glad to help.
Another success with one of my maps.
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Old 01-20-09, 06:29 PM
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well i thought that i was all ready for the dyno but i checked everything and found a werd vac signal to the microtech. so i fixed it and know the car runs like crap. with the vas unpluged it runs way better. you think that it is a tunning issue. i just dont want to go to the dyno and pay for it then figure out that something else is wrong.
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Old 01-20-09, 10:59 PM
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Do you know how to do a datalog?
Do a datalog on the microtech and send it to me and i can help.
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Old 01-21-09, 06:11 PM
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i got a log of it but i dont know how to post it up. also when i rev the engine it dosent seem like the mt timming is moving according to the log.
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Old 01-21-09, 08:38 PM
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Originally Posted by 13BT_Starlet View Post
Being that you are running 550/1600 your staging should be around 85% . Put a new set of plugs verify you plug wires are correct , alot of ppl have installed them in the wrong plug . if it still does it it could be a bad coil , pickup .
thank you, at least you sir, have a grasp for the obvious
though personally i find some variance in "1600" injectors
and also response differences between saturated and peak hold primaries
i find i am between 93 and 98 % usually for these combos

from the admin at micro forums -
Originally Posted by rxeng
If you are running 550cc injectors all round then 50% will work fine
do you have same injectors all around = no
so why is your staging value 50%???????
its because the map is bandaided in the higher WOT maps in the 2.5 D tune
and because the car is almost certainly staged at any WOT
so all numbers are set for the flow of 1600+550 , or 1600 + 1000
( or whatever funky combo the source had )
IMO this shows a distinct lack of understanding by the original tuner
it may work, but its all bandaids, and the staging **** pointless
as it is basically running four on anything but idle
---------

well i thought that i was all ready for the dyno but i checked everything and found a werd vac signal to the microtech. so i fixed it and know the car runs like crap. with the vas unpluged it runs way better. you think that it is a tunning issue. i just dont want to go to the dyno and pay for it then figure out that something else is wrong.
-NB, sounds like you plugged into the purge port on TB, its a ported vac and doenst suck at idle-

unplugged = never will stage and run all the injectors
( it will never see 2 psi )

[ if your switch point is 2 inch hg instead, the opposite may be true
also may switch in and out depending on atmospheric and MAP sensor calibration ]

plugged in, it sees 1320 rpm just off idle, so any WOT movement will see the turbo boost and trip the staging
with that 50% value in the staging, its adding 50% to the PWM BEFORE it stages
( ie the primary for that rotor is the bin value + 50% )

when it stages, all 2 injectors for that rotor run the SAME signal
( and the staging value is no longer added to the primary bin value )
BUT you have 550 and 1600
that is, say your asking for 1 ms on rotor 1
1 + 50 % = 1.5 ms x 550 cc= 8.25 cc fuel
staging then happens
1ms + ( 0 % ) x 550 cc + ( 1ms x 1600 cc )
= 5.5 cc + 16 cc

= 21.5 cc of fuel at the staging instant


IE one second to the next at the stage point , 8.25 cc becomes suddenly 21.5 cc
nearly 300% the FUEL FLOW THE INSTANT BEFORE

since yours stages at any throttle movement above 1320 revs
( where the motor isnt really needing a lot )
it is pretty obvious to see why it runs shitty isnt it??

[ bare mind if switch point is 2 inch HG not 2 psi
then the staging is reversed when vac line broken, ie 4 injectors always on ]


sheesh


FFS, read the micro site
dont take silly maps from the net
especially when you see the source at odds to the official website !!
are the alarms ringing or what????



Last edited by bumpstart; 01-21-09 at 09:04 PM. Reason: punctuation 101
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Old 01-21-09, 10:07 PM
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fine. you can help everybody here...
if someone needs anything. pm bumpstart. i couldnt be fucked for this **** anymore.
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