Did RX7 plugs screw my RX8 engine?
11-13-2010, 07:58 PM
#1
Did RX7 plugs screw my RX8 engine?
Hey guys,
Recently bought a used 2004 A/T RX8.
Previous owner changed the coils and spark plugs about 2months prior to me buying. I later discovered (today) that he used RX7 plugs - NGK BUR-7EQ leading and BUR-9EQ trailing but he didn't shim the trailing plugs.
Car worked fine for about 1 month then I started having hard start issues- i.e
Car starts perfectly fine on first/cold start ups and starts again easily after the engine warms or after a run if I switch off then immediately start.
However If I switch off and leave for a few minutes , I have to crank several times to get it started.
My question is -could the longer RX7 Trailing plug have deformed my housing and be causing low compression thus hard starts?
If I shim the Trailing plugs or change to OEM plugs ,will the problem go away?
Or has my engine been permanently damaged?
Thanks
Recently bought a used 2004 A/T RX8.
Previous owner changed the coils and spark plugs about 2months prior to me buying. I later discovered (today) that he used RX7 plugs - NGK BUR-7EQ leading and BUR-9EQ trailing but he didn't shim the trailing plugs.
Car worked fine for about 1 month then I started having hard start issues- i.e
Car starts perfectly fine on first/cold start ups and starts again easily after the engine warms or after a run if I switch off then immediately start.
However If I switch off and leave for a few minutes , I have to crank several times to get it started.
My question is -could the longer RX7 Trailing plug have deformed my housing and be causing low compression thus hard starts?
If I shim the Trailing plugs or change to OEM plugs ,will the problem go away?
Or has my engine been permanently damaged?
Thanks
11-13-2010, 08:40 PM
#2
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From what I read, the BUR-9EQ has to be used with a 2mm shim in the trailing position. If they weren't shimmed you might have damaged you apex seals, not your housing.
Last edited by [c]K; 11-13-2010 at 08:43 PM.
11-13-2010, 08:46 PM
#3
common complaint around here unrelated to the plug/shim issue . BTW - I don't run shims with the BUR9EQPs either but it is a good idea to at least put an extra crush washer on them .
check this thread .....
https://www.rx8club.com/series-i-trouble-shooting-95/hard-starting-suspect-your-starter-motor-check-out-207244/
check this thread .....
https://www.rx8club.com/series-i-trouble-shooting-95/hard-starting-suspect-your-starter-motor-check-out-207244/
Last edited by Brettus; 11-13-2010 at 08:49 PM.
11-13-2010, 09:06 PM
#5
Thanks Guys,
Hope They didn't do any permanent damage myself..but will shim them anyways just to be safe. Read that the BUR-9EQ are 3mm longer than the oem plugs
some dealers sell them already shimmed as in the pic below.
Oh I upgraded the starter to the N3Z2 model (Brand new) already so I know that can't be part of the problem.
BTW I'm from Trinidad West Indies -not too many mechanics with rotary experience here so I'll be depending on you guys alot.
Hope They didn't do any permanent damage myself..but will shim them anyways just to be safe. Read that the BUR-9EQ are 3mm longer than the oem plugs
some dealers sell them already shimmed as in the pic below.
Oh I upgraded the starter to the N3Z2 model (Brand new) already so I know that can't be part of the problem.
BTW I'm from Trinidad West Indies -not too many mechanics with rotary experience here so I'll be depending on you guys alot.
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