MS-2 does not restart

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Philip Lochner
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Posts: 138
Joined: Thu Feb 16, 2006 5:18 am
Location: South Africa

MS-2 does not restart

Post by Philip Lochner »

Here's the scenario:

I'm driving along in top gear (5th - manual) at say 2000rpm.

I then, without declutching, switch off ignition wait two seconds or so and then turn ignition on again. "Normal" cars would fire up and continue to drive as though nothing happened.

After doing this, MS-2 is NOT HAPPY, runs rough, no power, idles very low if I do declutch.

To correct, I have to switch ignition off, declutch, wait till engine comes to stop and then either start with starter or release the clutch on the move to "start" the engine again.

Is this normal for MS-2?

PS: Issues with IAC led to this :-)
Kind regards
Philip
Land Rover Discovery '95 4.6 V8i MS-2/V3/2.36/LC-1/EDIS
Jaguar XJS V.12 5.3, MS-2(2.686t11 - Dual table)/Dual LC-1/MSD6A/spark(VR/dissy)+fuel(LoZ+PWM)
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Bernard Fife
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Post by Bernard Fife »

Philip,

It sounds like the baro enrichment is wacky because the engine is still spinning (because you didn't declutch) when you restart it.

Lance.
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Ira
MegaSquirt Newbie
Posts: 3
Joined: Sun May 02, 2004 6:57 am

MS-2 does not restart

Post by Ira »

At 09:31 AM 4/28/2006, you wrote:
>I then, without declutching, switch off ignition wait two seconds or
>so and then turn ignition on again. "Normal" cars would fire up and
>continue to drive as though nothing happened.
>
>After doing this, MS-2 is NOT HAPPY, runs rough, no power, idles
>very low if I do declutch.

Think about how it get's normal air pressure reading. Adding a second
MAP sensor might cure the problem.

Ira

Posted by email.
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Philip Lochner
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Posts: 138
Joined: Thu Feb 16, 2006 5:18 am
Location: South Africa

Post by Philip Lochner »

lance wrote:Philip,

It sounds like the baro enrichment is wacky because the engine is still spinning (because you didn't declutch) when you restart it.

Lance.
In my native language we have a saying that if I translate directly to English would go like this:
"Pity that brains like these should rot" :lol:

I recon you've nailed the problem! Baro correction for my MS-2 is set to "Initial MAP reading" or something to that effect. With the engine spinning and 0 throttle that initial MAP reading is very low totally confusing MS-2. Another good reason therefore to fit the second pressure sensor for full time baro correction!
Kind regards
Philip
Land Rover Discovery '95 4.6 V8i MS-2/V3/2.36/LC-1/EDIS
Jaguar XJS V.12 5.3, MS-2(2.686t11 - Dual table)/Dual LC-1/MSD6A/spark(VR/dissy)+fuel(LoZ+PWM)
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whittlebeast
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Location: St Louis
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Post by whittlebeast »

Philip Lochner wrote: "Pity that brains like these should rot" :lol:
A very smart friend once said to me "Andy, It's not that I am that much smarter than you, . . . I just have a three year head start on this subject."

We in the US hsve a saying "Been there, done that" Now that you know what the issue is, it would be easy to search for. But with no clue what the problem is, you have no idea what to search for.

AW
Last edited by whittlebeast on Sat Apr 29, 2006 4:22 am, edited 1 time in total.
Sea-Doo 785 running MAF, V3 & Extra

www.v8efi.com Nearly self tuning Holley carburator replacement kit. Coming soon.
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masterx81
MegaSquirt Newbie
Posts: 10
Joined: Mon Oct 25, 2004 6:36 am
Location: Asti - Italy

Post by masterx81 »

Or can be added upper and lower limits on baro like in the extra firmware...
For my car i've preferred constant baro with second map...
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Philip Lochner
Helpful Squirter
Posts: 138
Joined: Thu Feb 16, 2006 5:18 am
Location: South Africa

MS-2 does not restart

Post by Philip Lochner »

whittlebeast wrote:
Philip Lochner wrote: "Pity that brains like these should rot" :lol:
A very smart friend once said to me "Andy, It's not that I am that much smarter than you, . . . I just have a three year head start on this subject."

But with no clue what the problem is, you have no idea what to search for.

AW
Wise words :-)

Now, would it not be a good idea to include this handy piece of info in the Megatune manual and/or in the Megasquirt manual?

Kind regards
philip
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