for those of yop that dont know

car is standard type r spec so vf23 plus front mount exhaust and the usual other parts plus the simtek ecu

the car runs perfectly even though i have removed all theparts from one shell and fitted to another and modify the maf wiring for the air temperature sensor and i think this is where my problem lies

basically the car starting is a bit rough but once warm the tickover is very high but when i unplug the air temp senosor the idle drops to what sounds about right

now i dont think i have wired it in wrong as i have done it as per exactly how i removed it from the other car where all was fine but there is just this problem and the fact that sometimes it can miss pop and bang all over the shop from cold but i think this is more down to a poorly charged battery

anyone have any ideas as to what my fault could be or a part number for the air temp sensor that is used?

cheers

 

get it on a dyno and see how its running. could be you damaged a sensor shifting it, or something else.

only way to be sure

 

id just swap the sensor if i knew exactly what part it was to be sure its the only thing it really can be as i dont think the wiring is wrong because its exactly how it was wired on the previous car

im reluctant to put it on the rollers because the engine that is in it is fooked and im building another one...i just want to be able to put my new one in and at least run it in on this map so i dont have to shell out twice for mapping

 

whats wrong with the engine in it? if its fooked anyway might just be that.

 

no just tapping slightly

with air temp sensor connected revs hang up etc but when you disconnect it they drop back down to an acceptable level

i initially though it was a fault with the icv but then when i disconnected and reconnected the air temp sensor iv pin pointed it to this

its asif there is a boost leak but i have checked all pipes and all are fine

 

Could be numerous things, easily detected with laptop connected.

 

i cant just connect any old lap top though hahah

is there anyway io can get a lead and the software just to monitor stuff myself or is that a no no with a simtek?

 

Yes you can

 

How?!

 

Pm me the ecu number and a phone number and I can sort

 

You already have my ecu number and phone number but i had to cancel my remap on the 11th of jan due to the fact my engine is fooked lol

 

As a suggestion, check that your plug leads don't run too close to your IAT wiring. Also check that the cam/crank sensor wiring on the drivers side isn't located too close to the plug leads either.
To eliminate it quickly, remover the driivers side plug leads from their usual location and relocate them at the front end of the inlet manifold instead of the rear.

 

Il try that but i think it is more to do with the temp sensor

 

Ah yes lol

The only issue I see with the software and dongle is that it wont be able to alter the current map as I havent mapped it yet. It would once I have mapped it.
It would be able to monitor and datalog parameters though.

 

Thats a good call Martyn. Is it me or has this issue been eliminated on the latest now alcatek as I havent had to move them in a long while.

 

What is the dongle i need? Would it not allow me to just monitor things like the air temperature sensor to just see if its wotking correctly?

 

It'll still occur now and then Simon, it just depends on the quality of the leads and the placement of the wiring. Does sound like that's the issue to me

 

Actually the old loom had the facility for an air temp sensor in the inlet to what would of been the airbox whereas on this loom i did not have that facility or the assosciaed wiring...could this be causing me problems or does the simtek bypass this as not all subarus i have looked at have it anyway?

My iat wiring gos around the bulkhead from the map sensor by the brake pipes to the top intercooler pipe just in front of the throttle body

 

dongle comes with the software to access the ecu. Yes it would.

 

Check where it crosses the ht leads

 

Agreed it does sound like it.

Used to be every 98 I installed required the wiring/leads rerouting.

Simon

 

I will re route the leads but the wiring for the temp sensor is quite a way out il double check it all later though and re route the leads like you say to see if it improves

Can i not monitor the air temps without paying for the license or once i pay for the license can it be mapped through my computer?

 

Its not a licence its a lead and dongle and software.

Yes it could be.

No other way to monitor what the ecu is seeing.

If you intend getting it mapped then possibly unnecessary expense buying lead and software.

 

Will i get a lead then when its mapped or do you mean when its mapped the problem will be rectified?

 

Problem rectified

 

Oh lol fair enough id still like it if im paying the license to be able to check on stuff if i can

 

did you try re routing the leads? i have high idle with my simtek may give this a go

 

you can get a lead and a software for it yes

 

there is no licence, you dont pay for a licence

 

leads wont cause a high idle.. the ecu can pick up interference on the wiring from the ht leads and it is worth routing them away from the wiring but it wont cause a high idle.

either it wasnt set low enough when mapped - would have been like it from day one, you have an air leak, or the idle motor is not functioning correctly.

Simon