Missing?

22-10-2005, 08:17 PM

Hi all, i have an EA 5spd multi point, the car has just started to develope a miss, i have no idea what it is, it sounds like a popping noise, as if the zorst was leaking, but i have checked all that out and there is no such leak.

Could it be the O2 sensor being on the way out?

Please help. I have no idea what to look for. Thank you

BlOWN-EA · 22-10-2005, 08:20 PM

answer these questions:
does it miss at idle
does the miss go on accel
does it flat spot

22-10-2005, 08:22 PM

miss on idle. yes
does miss go on accel. yes
does it flat spot. no

Sorry i should made my post clearer.

Thanks

BlOWN-EA · 22-10-2005, 08:29 PM

does idle fluctuate or does the engine just run rough

first of all grab your self a can of carbie clean start up your engine,
let it idle and spray all along the inlet manifold gasket if the idle dies or drops when you spray it you got a inlet manifold leak, can use that to find other vacumm leaks, check map sensor vac line.

the fact that you said it goes on accel, but missfires at idle and you hear a pop noise from exhasut reguarly at idle, you may have burnt valves, carry out running compression test, and compare cylinder pressures they shouldnt be too far apart for example:

Example 1
acceptable:
Cyl. 1 - 185
Cyl. 2 - 190
Cyl. 3 - 180
Cyl. 4 - 185
Cyl. 5 - 195
Cyl. 6 - 175

Example 2
not acceptable:
Cyl. 1 - 185
Cyl. 2 - 120
Cyl. 3 - 180
Cyl. 4 - 185
Cyl. 5 - 195
Cyl. 6 - 150

XR Martin · 22-10-2005, 09:05 PM

Checked spark plugs, leads, dizzy cap and rotor?

22-10-2005, 09:39 PM

Dizzy is pritty much brand new, umm, i think i might check all the vacume lines, so you dont think it could be O2 sensor? cheers

22-10-2005, 10:09 PM

There was a green vacume wire coming out of the fire wall, connectiong to a goldy coldered thing, like a round something not sure what it is, could that be the problem?

XR Martin · 23-10-2005, 12:29 AM

No thats the heater tap.

23-10-2005, 08:09 AM

So thats not a vacume line?-bummer

XR Martin · 23-10-2005, 11:25 AM

It is a vacuum line, but it wont make a difference on how the car runs.

23-10-2005, 03:55 PM

Okay, now it is really bad, near undrivable. the further u drive it, the worse it gets, was going for about half an hour, and it is just constant miss, but when you rev it out a bit more, it will stop until you are doing normal revs again.. I got no idea

It also is now developing flat spots..

JUZXR8 · 23-10-2005, 07:16 PM

sounds to me that you need to check out your spark plugs and leads

23-10-2005, 08:58 PM

Yer, i need to by plugs, i have a set of 8mm leads here that are new, i unplugged my O2 sensor wen it was missing, and nothin at all changed, mite grab one of them to...

Just gota find some time to go get it all...

Could it be anything else? Cheers

BlOWN-EA · 23-10-2005, 09:44 PM

have u done anything of wat i said, swapping parts till u get it right doesnt work to well just carry out the apropriote tests to find wat the prob is, remember measure twice cut once

XR Martin · 24-10-2005, 12:42 AM

I dont think it will miss with a bung O2 sensor, just run hell rich.

Could also try the Map sensor hose. The Map sensor is under the top of the firewall near the main loom of wires, just above the heater hoses. Check the hose that connects to it for cracks or splits.

24-10-2005, 06:39 AM

Well, i have sprayed carby cleaner around everywher, like around all the vacume hoeses, nothing. i'l just change the plugs and leads, havnt had time to do a compression test, but if it was in the head or "mechanical" wouldnt it do it all the time? cause when the car is cold it is beautiful. only after it heats up is when it turns to the bad side.... lol.

Thank you all for help

24-10-2005, 09:03 PM

It stoped for me in the shed 2nite, after a few hours of fault finding, it was the coil... It lot easier to find when completly stoped... Should have part in and going by tomorrow hopefully... fingers crosts i can get a coil tomorrow