Engine shut down over 4000rpm

Klas gt4
Posts: 10
Joined: Wed Jul 01, 2009 3:33 am

Engine shut down over 4000rpm

Postby Klas gt4 » Thu Jan 07, 2016 2:22 am

We have for 2 days tried to gigure this out with no succes.
The timing jumps around a little at idle, but the main problem is that the engine shuts down over 4000 rpm.
Slowly free rewing the engine, works fine up to around 4000rpm, then I get a rpm spike on the computer and tacho at about 11000rpm then the engine just dies, no spark at all.
here is the setup:
4 cyl 3sgte toyota turbo
1000cc injectors
4 ls2 coils
Aluminium cranc trigger with steel inserts 12 tooth
Cam sensor in custom made dizzy
Both sensors are honywell 1gt101dc hall sensor
E6x
3bar map sensor
rpm limit set to 6500rpm

injection mode- multipoint
ignition devided by 1
Trigger angle- 52
Tooth offset- 2
Spark mode- direct fire
Spark output- constant charge
Spark edge- falling
Constant period- 4ms
Coils on 4 cyl- 4coils

Trigger setup:
Multitooth
Teeth- 24
Tooth offset- 2
Trigger input pull up on
Trigger input- hall effect
Trigger edge- falling
Home input- hall effect
Home edge- falling

I have a log but I cant upload it here for some reason.
The trigger signals seems to disappear

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HaltechMatthew
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Posts: 2578
Joined: Tue Feb 07, 2012 12:45 pm
Location: Sydney, Australia
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Re: Engine shut down over 4000rpm

Postby HaltechMatthew » Mon Jan 11, 2016 2:16 pm

I think you diagnosed it already.... trigger signal disappears.

Try a smaller air gap.

Klas gt4
Posts: 10
Joined: Wed Jul 01, 2009 3:33 am

Re: Engine shut down over 4000rpm

Postby Klas gt4 » Tue Jan 12, 2016 3:19 am

The home trigger occurs almost at the same time as the crank trigger, maybe that's, the problem, can the ecu be "confused" at higher rpms if that is the case?
I can try move the home sensor just by rotate the dizzy a little.
I have read somewhere that it can cause problem if the both sensors trigger to close. It´s odd that both the home and crank signal disappear at the exact same time.

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HaltechMatthew
Haltech Staff
Posts: 2578
Joined: Tue Feb 07, 2012 12:45 pm
Location: Sydney, Australia
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Re: Engine shut down over 4000rpm

Postby HaltechMatthew » Tue Jan 19, 2016 1:54 pm

Definitely. The cam and crank pulses cannot occur at the same time. The system uses the cam sensor to start synchronising by then counting a number of crank teeth after it. If the cam pulses occurs before a crank tooth and then randomly after it then the count is also random.

A small hint. You will typically get a better running engine by using sequential fuel and wastespark ignition then you will by having multipoint fuel and direct fire ignition.


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