3000M bad misfire when hot

3000M bad misfire when hot

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Discussion

anonymous-user

55 months

Wednesday 10th August 2016
quotequote all
plasticpig72 said:
o.k. i'll do a test for gas in coolant to check head gasket but i hope it's not the head gaskets. I've never taken the heads off a V6 beforeeek. I'll cross my fingers when i do the test and hope it proves head gaskets to be goodsmile
I've just ordered the kit RESTOM DETECT 8840 it's a pink liquid that changes colour if gas present
Alan

Edited by plasticpig72 on Wednesday 10th August 08:23
Would have thought most "local" garages would have been able to do the test for you?

wild rover

447 posts

182 months

Wednesday 10th August 2016
quotequote all
Have you checked the engine bay in the dark to see if there is any arcing.

plasticpig72

Original Poster:

1,647 posts

150 months

Wednesday 10th August 2016
quotequote all
TVRMs said:
Would have thought most "local" garages would have been able to do the test for you?
I imagine so but the kit is 12.50 Euros = £10.I live in Brittany.
Alan

anonymous-user

55 months

Wednesday 10th August 2016
quotequote all
plasticpig72 said:
TVRMs said:
Would have thought most "local" garages would have been able to do the test for you?
I imagine so but the kit is 12.50 Euros = £10.I live in Brittany.
Alan
Fair enough Alan smile

anonymous-user

55 months

Thursday 11th August 2016
quotequote all
Is it auto choke and getting too hot from it or not functioning right?

plasticpig72

Original Poster:

1,647 posts

150 months

Thursday 11th August 2016
quotequote all
I will double check the auto-choke. Maybe fix in off position and bypass the coolant hose to stop carb getting hot coolant through it.
I have put it on my list of things to do
Alan

Slow M

2,737 posts

207 months

Thursday 11th August 2016
quotequote all
If, as you said earlier, the choke is working correctly, then I have two thoughts.

1.) Spark plugs in the wrong heat range.

2.) Carb jetted incorrectly, and it runs fine, as long as the choke is on.

Best regards,
Bernard.

plasticpig72

Original Poster:

1,647 posts

150 months

Friday 12th August 2016
quotequote all
Maybe i'm wrong and it won't be the first from far but i think it's a misfire which suggests Electrical problem. I have ordered new condenser and points which are easy to change. For me the problem is not a splutter which would be carb.
1.I am sure the return line i have added at the fuel pump outlet was needed, now pump stays cool and also fuel line.
2. I have fitted a Bosch 12V pressure filled coil and removed the cold start with resistor.
When i have fitted a new condenser and points i will road test and see
Alan

anonymous-user

55 months

Thursday 18th August 2016
quotequote all
Did you do your gas test Alan?

plasticpig72

Original Poster:

1,647 posts

150 months

Thursday 18th August 2016
quotequote all
I have fitted new points and condenser and taken car for a 20+ run and it still starts to misfire after 20 miles or so.
I will do the Gas test in a week or so and report back.
I've decided to take a break from the 3000M for a while.
Alan

Dollyman1850

6,318 posts

251 months

Thursday 18th August 2016
quotequote all
Has to be the auto choke.
Is it a water or electric bi metal one? If so disconnect it and jam open the lever plates to test it.

N.

plasticpig72

Original Poster:

1,647 posts

150 months

Thursday 18th August 2016
quotequote all
Will do dollyman (was it a dolly sprint, always liked them)
It's an autochoke for the moment and the car does seem very thirsty.rolleyes
Anyway i don't like auto chokes and i don't want hot water flowing through the carb.
I have a manuel kit in my stock of goodiescool That swmbo hasn't accounted forcool
I need to get the 3000M through "la Contrôle Technique" (french mot) then i can get a "Carte Grise Collection" (V5 for cars over 30 years old).
Alan

Astacus

3,384 posts

235 months

Thursday 18th August 2016
quotequote all
plasticpig72 said:
Will do dollyman (was it a dolly sprint, always liked them)
It's an autochoke for the moment and the car does seem very thirsty.rolleyes
Anyway i don't like auto chokes and i don't want hot water flowing through the carb.
I have a manuel kit in my stock of goodiescool That swmbo hasn't accounted forcool
I need to get the 3000M through "la Contrôle Technique" (french mot) then i can get a "Carte Grise Collection" (V5 for cars over 30 years old).
Alan
HA HA,

When we lived in France we had to get a Carte Gris. Take the application to one window where it is read and checked and then stamped. Take the stamped application to another window where they take your money and re stamp it then take the double stamped form to a third window to pick up the carte Gris document. All in the same room

Mad

plasticpig72

Original Poster:

1,647 posts

150 months

Tuesday 30th August 2016
quotequote all
My 3000M has passed "Contrôle Technique" (french mot) + i now have "attestation FFVE" (type approuval certificate).
The new system is
1. present papers V5, FFVE and application.
2. go to pay at cash desk.

Very simple and "Carte Grise" arrives by post at your house about 3 days later.
In England i think you get the V5 about 3 weeks later by post.
Alan

Astacus

3,384 posts

235 months

Tuesday 30th August 2016
quotequote all
That sounds like a great improvement!

plasticpig72

Original Poster:

1,647 posts

150 months

Tuesday 30th August 2016
quotequote all
I have just looked at the Fuse Box to check to see if all spades are nice and tight/clean. I found a few loose so adjusted them and cleaned.
Next to the Fuse Box are several harness connecters.
One of the connecters for a big Brown wire in and out original NO BIG BROWN WIRE which is the power supply to Ignition Switcheek The wire had been cut where it enters connecter and cut at exit. Some idiot had reconnected the Big Brown Wire with a chocolate block to bypass the connecter which makes a very iffy contact in true Heath Robinson/Macgyver style.You can imagine i am well impressedrolleyes
Could this be the cause of the misfiring with a bad contact. F.I.O. the chocolate block is in the trash can.
Alan

Andrew Gray

4,969 posts

150 months

Tuesday 30th August 2016
quotequote all
plasticpig72 said:
I have just looked at the Fuse Box to check to see if all spades are nice and tight/clean. I found a few loose so adjusted them and cleaned.
Next to the Fuse Box are several harness connecters.
One of the connecters for a big Brown wire in and out original NO BIG BROWN WIRE which is the power supply to Ignition Switcheek The wire had been cut where it enters connecter and cut at exit. Some idiot had reconnected the Big Brown Wire with a chocolate block to bypass the connecter which makes a very iffy contact in true Heath Robinson/Macgyver style.You can imagine i am well impressedrolleyes
Could this be the cause of the misfiring with a bad contact. F.I.O. the chocolate block is in the trash can.
Alan
Whoever invented those things should be shot the most horrible things going.
Sounds like your re building the car one bit at a time Alan.
Eventually you will have done it all
Andrew

plasticpig72

Original Poster:

1,647 posts

150 months

Monday 14th November 2016
quotequote all
Well i've been resisting but i have decided TO BIT THE BULLET.
THE HEADS ARE COMING OFF. This is the first time on an Essex V6. I'm used to working on Lotus Twin Cams. I have set the engine at 10° firing on n°1 before i remove the heads.
Alan

anonymous-user

55 months

Monday 14th November 2016
quotequote all
I'll bet on it being carbs getmecoat

phillpot

17,118 posts

184 months

Monday 14th November 2016
quotequote all
plasticpig72 said:
I have set the engine at 10° firing on n°1 before i remove the heads.
Alan
Taking the heads off won't disturb anything, it's not ohc and dizzy can stay in.