Topic: 20r #4 cylinder dead

[toyotanner]

my buddy has a 20r motor that the #4 cylinder isnt firing has 155 pounds of compression  good spark but when you pull the plug wire it doesnt drag down the motor at all like the rest of the cylinders do... Any thoughts?

[79coyotefrg]

[Dr Phat]

No fuel?

[spc mike]

Probably valve related.

[Dr Phat]

If it was a valve problem I dont think he would have compression.

[twistedtoy92]

spark at the plug end or the wire end? couldnt be fuel because its not injected....

[83 Crawler]

It's his full map gots a nasty hole

[toyotanner [OP]]

HE drives it everyday... I almost wonder if somethings blocking the intake port

[Dr Phat]

Ah, didnt know it wasnt EFI.

[prawl44]

that happen to me i just change the plugs just becuse it has spark dosent mean that the spark is Strong enuff  you know try that cheep fix

[83 Crawler]

That's a good point but I'm pretty sure the plugs are new

[prawl44]

if sooo thin hhmmmmm i gotta think on this one

[twistedtoy92]

if you want to test a spark plug then pull it, hook it up and have someone turn it over. if the spark is blue then you are GOOD! the more orange it is then I'd recommend replacing it.