Bostig Conversion Running Rich

[Williamtaylor33]

I have a newly installed 2010 version of the Bostig conversion in my syncro. Its run rich since it was installed and im still trying to sort out why.

Heres what's been done so far:
-New PCV valve and hoses
-Run a smoke machine into the intake to check for vacuum leaks. Found one and fixed it.
-New O2 sensor (had a backup anyway)
- New TPS
- New IAC valve
- Checked fuel pressure. All is well...holds at 32 while idling and jumps to 40 with throttle. It also holds pressure for at least 20 minutes after shut down.
- Gas in tank is less than a month old. Was completely drained.
- MAF seems to be working as it should according to the data log. But I have several known good maf sensors and even an extra air box I've have swapped with no change.
-Air filter is new
-Went thru wiring and cleaned/checked every ground
-Verfied correct injectors are being used. Have a separate set of injectors for this motor and swapped them out with no change


to get the van to start I can either wait a day...or else pull the fuse to the fuel pump and crank over. It will start almost immediately with the fuel pump not working. and then I can replace the fuse to start the fuel pump and it will continue running....albeit about 30% rich.
Then after shut down it will not restart unless I repeat the above process.

Me and Jim have exchanged datalogs and tunes...so im still hopeful that will resolve the issue. However the latest tune which reduced fueling by 30% still doesn't seem to make a difference.

I am getting one code...P1289 (CHT sensor signal greater than self test range)
Im gonna order a new CHT sensor and install.
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89 Bostig powered syncro westy

[skills@eurocarsplus]

you may have a bad ECT (unless ferd calls them a CHT) sensor.

drop dead cold, key on, what does your coolant temp say on the scanner? usually almost every ECT i have seen fail goes to -60*

cold reading (as in before you start it) should be within a couple of degrees of ambient

could be a fuel pressure/leaky injectors as well
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[MarkWard]

Have you visually checked the injectors? One of 2 things are going on. Either the ECU thinks the engine needs more fuel and is adding it or you may have a leaking injector that is spraying continuously.

You should be able to ohm out the CHT valve and compare it to known values. A cold engine requires more fuel during warm up, so it's possible the CHT could be sending an erroneous value to the ECU.

[valvecovergasket]

[Williamtaylor33]

[Williamtaylor33]

[MarkWard]

I don’t have enough knowledge of your conversion to be of much help. If I were working on it I’d try to affect a change.

First I’d disconnect the oxygen sensor and put the ECU into open loop. This will let you see how the engine is really running.

Next step, if you have a graph of the CHT resistance, you could add a fixed resistance so that the ECU thinks the engine is hot.

[Microbusdeluxe]

Send a datalog to Bostig Jim.
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'69 Squareback RIP
'65 21 window deluxe sold before the price spike, damn it.
'70 rhd bay now a taxi in South Sudan
'81 Westy sold
'89 hightop Westy Joker syncro 16" now with Bostig!