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Engine Sputtering this morning below 1500-1800 rpm
Topic Started: Nov 23 2011, 10:52 AM (1,490 Views)
nerys
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Grr

Went to goto work this morning. Had not run the metro in 2 days (I don't drive unless I have too waste of gas)

when it sits its a bit cranky (I am assuming a micro leak in the fuel system letting fuel drain back to tank??)

but this time it would not stop sputtering for over 10 minutes (long after warm up so not compression)

once above 1600-1800 rpm the sputtering went away and it ran fine.

about 10 minutes after this video it just "stopped" doing it

I could smell fuel while it was doing it so I am assuming it was a cylinder misfire. fouled plug maybe ?? gonna pull them alter.

I only have about 70,000 miles on these plugs - do the plugs in this engine not last as long as normal?

Edited by nerys, Nov 23 2011, 10:52 AM.
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mcmancuso
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70K is pretty good for a set of plugs, I only run mine about 25K (I run NGK coppers platinum or iridium will last longer)
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TheKid
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Sounds like a missing issue.... plugs maybe?
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crankcase


It would be cool to have a vacuum gauge hooked up when it does this to look at the readings.

For a guess, I would go with: vacuum hose bad, plug or coil wire loose/bad, TPS alignment.
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nerys
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Grr

tps is throttle position I don't see how that will cause a mis like this (smell fuel so one or more of the cylinders failed to "ignite" the fuel charge)

VAC is good idles smooth and steady

I am betting fouled plugs.

I usually use plugs for 100k. never changed any earlier than that. in fact they usually don't need them at 100k I just do them during my 100k tuneup. though for me 100k tuneup is every 2.5 years :-)
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crankcase


I had a misaligned TPS sputter when you gave it the gas, alignment fixed it. Your was not as bad as mine (it would almost die). Maybe try the vacuum test if it get bad. Good luck.
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snowfish
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Basic GearHead

nerys
Nov 23 2011, 10:52 AM
I only have about 70,000 miles on these plugs
:smackface I'd try the sparkies. Easy, :gamerz cheap, :news & better winter starts :drivin .

Heck, there's only 3. :thumb

Mine sputtered the other day too. Cold & damp out. :cold Gave it a couple boots & cleared the frost, condensation,etc, out. :nfs All good now. But I have less than 10k on my sparkies. :backpack
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Bad Bent
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Facetious Educated Donkey

All of the above. :)

How many miles on your plug wires? Cold and damp equals moisture and possible errant spark. You've seen the video of spraying water/soap on the wires to detect spark.

Distributor posts and rotor clean?
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nerys
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Grr

has not done it again. I am guessing fouled plug that "cleared" next chance I get will just change plugs and wires. wires are getting hard (but no leakage) going to try and find some good double shielded silicon wires. these are crap :-)
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Bad Bent
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Facetious Educated Donkey

Take a look at www.robietherobot.com/metro3cylWires and see if you like them. :scared
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nerys
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Grr

wow they appear rather nice a bit expensive at $60 a set but nice. has anyone tried them? thoughts?
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Woodie
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Plugs are supposed to be changed every 30K miles. With the wet weather, I suspect the wires or cap.
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snowfish
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Basic GearHead

nerys
Nov 24 2011, 04:02 AM
has anyone tried them? thoughts?
I have the yellow 8mm wires on my 91 project. Mine came from one of 3Tech's vendors when I ordered the head package. Same price.

Had I not painted up the engine & compartment, the stock wires would have gone one. I just like the contrasting colors.
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nerys
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Grr

huh woodie never experienced that. I always bought good wires and good plugs and changed every 100k or so. one time I had a set go 150k. I have always changed that kind of stuff roughly by time more than by miles because I drive so many miles.

now mind you 30k and 100k are about the same "time frame" comparing me to a regular person.

I drive 100k in 2.0 to 2.5 years a regular person drives 30k in 2.4 years.

if this car is "rough" on those kinds of components for whatever reason what I do NOT want tod o is spend $60 on a set of wires that is not going to last any longer than the $15 set of wires :-)
Edited by nerys, Nov 24 2011, 01:35 PM.
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Bad Bent
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Facetious Educated Donkey

I want to say you get what you pay for but yes a $15 set of wires at 7mm will work fine.

The propaganda on some nice 8mm Taylor wires from www.jegs.com is:
# More fire power to spark plugs than OE resistor core wires
# Up to 10 times less resistance than typical resistor core wires
# Highly-conductive resistor spirals with stainless steel wires and fluorocarbon covers
# Exclusive, low-profile boots with grips and vibration-proof, double spring locking spark plug terminals
# Radio frequency interference (RFI) is eliminated, a must for a multispark discharge or electronic ignition and on-board computers
# Two layers of pure silicone provide the highest temperature rating
on the market (600°F) without the need for additional sleeving

But it's a Geo and you probably won't notice any difference or 10 times less resistance, better conductivity, fancy terminals, RFI or have the need for 600oF protection. :lol

Me, I upgrade when I can for something that maybe somebody took a little more care in engineering and assembling. Something that might survive under race conditions and will certainly survive under mine. :-/
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