245 running early 740turbo

Sunshine 245

Ok, so I impulsively bought a 245 that has had a early 740 intercooled turbo motor dropped in.

It's running a microsquirt controller but is having issues and as this is my first Volvo I am seeking advice.

Running high idle in park, and above a certain rev speed it starts to misfire.

I can't tell the rev speed because the tacho is not working in the dash, I'm guessing that there must be a tacho input to the microsquirt.

Anyway can someone tell me everything I need to know to make everything work, getting it pumping huge hp, and keep it reliable 🙂

Just a small ask�

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Please bear with me on this, as I have said I am a complete noob so have posted a bunch of engine bay pictures

ramrod

Where abouts is the car?

It could be a number of different things causing that issue, best to go back to basics and examine all the foundations from the start

If in Sydney or nearby I can help

Sunshine 245

Thanks for the reply, I'm in Perth unfortunately.

ramrod

Bugger

Any vacuum leaks?

Sunshine 245

ramrod I think I am good there, was some dodgy lines but are replaced now

timbo

I guess you need to work out if it's originally an lh2.2 or 2.4 setup. Does it still run a maf sensor? Maybe post a pic of the engine bay

Sunshine 245

timbo I'll post some pics tomorrow, pretty sure it's running a map, and wideband o2/lambda, and I think it is only used for fuel control.
It's running a coil and distributor, not sure if this is relevant, I am fairly intelligent but new to this sort of stuff.
I have the microsquirt manual and the tuning suite, but I am not willing to touch anything yet until I know more.
Am probably going to get a proper tune done when I have spare cash, but until then I want to learn as much as possible.

timbo

High idle could be as simple as a vacuum leak.

Check the idle air hoses for splits etc.

Check what kinda ignition setup it has, as maybe the tacho has never worked after the engine was swapped . We can advise on what wiring to check once we get a look at what setup its got.

Forg

The descriptions I’m seeing of this car & it’s current problems make me suspect that with a little bit of work (and prolly some knowledge from redblock experts) you can likely get a car that’s like a billionty times nicer than it currently is! 🙂

Sunshine 245

Forg that's a lot of times better 😂

Sunshine 245

So under the throttle body was the black plastic tweaker, which I tweaked, and the in park revs have been bought under control now it seems.

Sunshine 245

Is there a chance that the throttle position sensor may be out if whack, if I understand things it's an ohms reading that I might need to check.
If so I need a multimeter, so a trip to the tool store as my fluke has had an accident and requires a new screen.

nugget_940

Sunshine 245 yes that is a possibility, there may also be a configuration in the microsquirt something along the lines of "minimum tps"

What this does is tell the computer if TPS <1% then enable idle control.

If the actual TPS is out (lets say 2% open), then the idle control circuit won't enable because its above the minimum tps threshold

nugget_940

also just thinking out loud, check the part number on the TPS itself

I wonder if the previous owner used an lh2.4 on/off or changed it to an 850 style potentiometer

Sunshine 245

nugget_940 it's got a Bosch 0280122001, so a potentiometer I believe

KBee

May I suggest you give Jake @ West Coast European in Bayswater a holler, he looks after our 142 and 245, used to be at Perth Swedish. Highly recommend!

Sunshine 245

KBee awesome thanks mate I will hit him up

Ex850R

You need a tuner that knows MS

GingerNinja

Is the Microsquirt only running the fuel side of things? not the sparks too?

Sunshine 245

GingerNinja it has a distributor controlling spark and a hall effect? sensor for rpm input to the squirt

jamesinc

Sunshine 245 yeah but what fires the coil, the microsquirt or the stock 240 ignition controller?