100,000 mile tune-up includes plugs and wires. Do them. Check your air intake filter, replace it any way you like. Replace your fuel filter. Then see how it runs.
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09-06-2011
100,000 mile tune-up includes plugs and wires. Do them. Check your air intake filter, replace it any way you like. Replace your fuel filter. Then see how it runs.
09-06-2011
Engine is perfectly fine during normal or even rough driving, it starts right up and drives normal. Just under high speed.. Try driving with 3100k bulbs in a lighthousing whos reflectors are outdone by ones on a bicycle you get from wally worldOriginally Posted by Hippo Machine
.. I just got this car 1k miles ago, but it looks completely stock...except 2 12in subs and a massive amp in it, professionally installed atleast. Beleive it or not, rock sounds good with the ghetto blasters
. Also this may be dumb, but would a dirty air filter be the problem? It had a new one at 86k. ALSO, previous owner stated he replaced the MAF sensor, if that is of any use
09-06-2011
Protip: If you're not going to take advice a lot of people will give up on helping you.
And no, an airfilter will not cause a status that would make your CEL blink.
Originally Posted by W-Body Store
09-06-2011
I'm justsaying I got my car checked out before I bought it and the mechanic said it was good. 3 weeks after, I blew the engine up. I went WOT at 80 MPH, and coolant leaked into the engine, so I guess you could say it happens only at "high speeds". AND just because you see it at high speeds doesnt meant it isnt causing problems...
Get a new air filter, oil change, oil filter, spark plugs, wires, and coolant flush (just cause) and see if the problem is still there.
09-07-2011
And fuel filter lol
09-07-2011
[QUOTE=Hippo Machine;636331]I'm justsaying I got my car checked out before I bought it and the mechanic said it was good. 3 weeks after, I blew the engine up. I went WOT at 80 MPH, and coolant leaked into the engine, so I guess you could say it happens only at "high speeds". AND just because you see it at high speeds doesnt meant it isnt causing problems...QUOTE] Previous owner stated he had all fluids changed, but who knows if he lied or not. Either way I think its that awful dexcool so i was planning on rad. flush soon. Ordering plugs & wires tonight, hope thats the problem -.-
So AC delco si recommended over NGK? Or are they both about the same?
Last edited by mattstansbury; 09-07-2011 at 10:04 AM.
09-07-2011
I'm running NGK V-Power TR55's in my 00 GT and it runs fine. They are copper and I check them every time I change the oil. So far no issues. I run OEM Delco wires from my local GM dealer. Limetime warranty as long as they just wear out and not damaged by other things. I chuck them back in the box, show the receipt and they hand me a new set. They don't cost much more than any other brand even though I get them from the dealer, either.
09-08-2011
I just dont understand how it could be from a misfire at high rpm...i put in neutral coastin and held at 5,500 rpm and ran just fine...Unless the load on the engine causes it? If a fuel filter plugs and wires dont fix it. I might run a can of seafoam through it. I really appreciate the help at this forum.
Last edited by mattstansbury; 09-08-2011 at 10:01 AM.
09-08-2011
A misfire can be from many things.
The engine's knock sensors detect the misfire by noticing some noise or lack of a cylinder fire when it's expected.
Therefore .. it can be caused by anything that would keep a cylinder from firing properly.
The most comon:
Plug
Wire
Coil
Injector
Vacuum leak at injector o-ring
O2 wiring touching a plug wire (#4 or #6)
The less common:
Chipped piston
Cracked piston
Moisture in cylinder from LIM or other gasket
Vacuum leak from gasket (air related)
Typically misfires are worse under load, therefore it would be more readily found at that point.
I'd hook up a scanner and go for a ride with the 6 cylinders showing misfire info in front of me. Look for the one that lights up. That's where you concentrate your efforts.
09-13-2011
I've had your exact problem twice, both times hooked up to the scan tool, cylinder number 5. Pulled the plug and the porcelain on the plug had a hairline crack. A 10 minute 2 dollar fix.
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