my elan scan for review

[tte200]

Hi,

I would appreciate it if someone could check this elanscan log. I'm having difficulty starting the car and it seems to be running rich. The car is an SE 1991 standard except for big exhaust and ported wastgate.
I am also having difficulty put the car in service mode to do the base timing as the car either stalls or runs very lumpy

Thanks
Terry

[tte200]

Hi another scan of the car on the move

[rip]

Hi Terry,

I have taken a look at both files but cannot see anything which looks obviously wrong.
Have you tried checking the timing without putting the car in service mode? When idling the timing should be fairly steady. If not, it could point towards a flaky CAS.

I noticed that in your run, knock count was 1 which is not a lot.
Are you getting much performance from your boost? If not, you could try advancing the timing. Advance it until knock increases significantly then back it off a bit.

Sorry I couldn't be more conclusive.

[saska]

I would appreciate it if someone could check this elanscan log. I'm having difficulty starting the car and it seems to be running rich. The car is an SE 1991 standard except for big exhaust and ported wastgate.
I am also having difficulty put the car in service mode to do the base timing as the car either stalls or runs very lumpy.

Apologies for late reply. Have looked at both scans but, like Rip, don't really know what to make of them so I'll have a ramble:
1. Your idle is ~1000 RPM when mostly the target idle is 950 RPM. The Air:Fuel ratio is 14.0 @ idle whereas it is mostly 14.5 when not idling. This suggests the ECU is compensating at idle for something via the A/F ratio.
2. Your max throttle was 72% when the engine was at 5K RPM and 0.62Bar boost and you were making 139BHP (calculated). Were you at wide open throttle then? If you were then the TPS and/or throttle cable needs adjustment.
3. In the quickrun scan the first idle period (70-140secs) has a spark advance of around 10°BTDC whereas the second idle period (560-680secs) has a spark advance around 18°BTDC. The second idle period has a wider range than the first -- dunno why this should be.
4. The IAC goes mental @ 138.1secs in the quickrun.
5. Max boost was 0.66 Bar. Pretty close to spot on if a std map.
6. Max power was 146.3 BHP @ 5250RPM in second gear. If this was on level ground then v. respectable.

The following is worth what you're paying for it:
My instinct says you have a small vacuum leak somewhere. Problem is you're making good boost which contradicts. Were it me I'd pull the vacuum hose to the boost guage sensor (O/S of manifold) while the engine was running. If the revs rise then you don't already have a leak -- if they don't rise then you already have a leak. See HERE for the vacuum hose diagram.
If you don't have a leak then the next thing I'd check is the base timing but since you're having a problem with this then I'd follow Rip's advice and increase the spark advance -- move the CAS slightly clockwise and then see if you can do the base timing.
Beyond that I dunno but probably next port of call would be check the tickover.
After that i'd consider replacing the HES in the CAS

[tte200]

Tony - saska
Thanks for taking the time to review my scans,
Will start with recommendations and re scan the car but before I do few questions
In point 3 you refer to 10 BTDC and 18 BTDC – where did you read this?
Point 4 you refer to the IAC – what is this?
Thanks again
Terry

[saska]

In point 3 you refer to 10 BTDC and 18 BTDC – where did you read this?

In ES plot X-Axis as time and Y-Axis (Curve Parameter) as Spark Advance. The car was idling @ 70-140secs & 560-680secs.

Point 4 you refer to the IAC – what is this?

Idle Air Control -- again in ES set X as Time and Y as IAC Position.