450SE Miss fire
Discussion
Hi Guys, my 450SE seems to miss firing on numbers 5 and 6(opposite banks) as when I've taken the leads off those it doesn't seem to make any difference to the engine note. I've tried different leads, dizzy cap and rotor arm which have made no difference.
Any ideas would be great......
Cheers
Nick
Any ideas would be great......
Cheers
Nick
BEWARE - this info is based on a 1985 flapper engine, I reckon that there will be something similar on hot-wire systems.
The injectors are specified to work at 6v (a lower voltage than 12v), this allows for cranking etc. when the voltage drops - so there is a resistor in circuit with each of the injectors. The resistor pack contains all 8 resistors and is about the size of a ciggy packet with 9 or 10 wires going into it, in my 390 it is mounted on the inner wing under the bonnet and is marked Lucas.
The connector pins often get a bit corroded and benefit from a disconnect/connect cycle.
The pins carry a fair bit of current so show this problem more than signal wires.
If this works then you need to remove the connector once more and smear the pins with adeline to prevent further corrosion.
Russ
The injectors are specified to work at 6v (a lower voltage than 12v), this allows for cranking etc. when the voltage drops - so there is a resistor in circuit with each of the injectors. The resistor pack contains all 8 resistors and is about the size of a ciggy packet with 9 or 10 wires going into it, in my 390 it is mounted on the inner wing under the bonnet and is marked Lucas.
The connector pins often get a bit corroded and benefit from a disconnect/connect cycle.
The pins carry a fair bit of current so show this problem more than signal wires.
If this works then you need to remove the connector once more and smear the pins with adeline to prevent further corrosion.
Russ
First I'd have a look under the bonnet in the dark to see if there are sparks flying around where there shouldn't be.
Other than that, it's probably best to take it to a someone with Crypton or Suntune machine to see if it's an ignition problem....much cheaper and more accurate than starting on the usual (more expensive)trail of replacing parts which probably aren't needed.
I had a miss-fire on my first TVR...280i, and the machine immediately found the problem...one knackered spark plug. To the naked eye the plug looked perfectly ok, but it was the porcelain insulator that was at fault. Cost - £30 including the diagnostic session.
The next time it was the 400SE. General miss-firing and lack of power. Diagnosis... play in the distributor shaft and timing out (plus a couple of other minor adjustments that I've forgotten the details of).
Cost...£75 for at least an hour of a race mechanic's time setting up timing and other adjustments. Then I was able to go out and buy the CORRECT part.
Other than that, it's probably best to take it to a someone with Crypton or Suntune machine to see if it's an ignition problem....much cheaper and more accurate than starting on the usual (more expensive)trail of replacing parts which probably aren't needed.
I had a miss-fire on my first TVR...280i, and the machine immediately found the problem...one knackered spark plug. To the naked eye the plug looked perfectly ok, but it was the porcelain insulator that was at fault. Cost - £30 including the diagnostic session.
The next time it was the 400SE. General miss-firing and lack of power. Diagnosis... play in the distributor shaft and timing out (plus a couple of other minor adjustments that I've forgotten the details of).
Cost...£75 for at least an hour of a race mechanic's time setting up timing and other adjustments. Then I was able to go out and buy the CORRECT part.
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