Hesitation at middle RPM under moderate load
in [Technical]
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From: ben91932 on 23 Jul 2010 15:55 > Wires. I used genuine Autozone "DuraCrap" wires, so this was the second > thing that popped into my head. I'd start by misting the plug wires with the engine running and watch for a light show. Like someone said, it may be worth unplugging the egr valve and test driving... HTH, Ben
From: larry moe 'n curly on 23 Jul 2010 17:37 Ray O wrote: > > I second the carbon buildup on the valves. Hook up a vacuum gauge, and when > the problem is occurring, see if vacuum drops. If the Techron doesn't work, > find a shop with Motor-Vac or that has a way to do the walnut shell blast. > > As Tegger mentioned, the EGR is also a possibility, but not likely to cause > the seemingly random other than heat symptoms you're describing. This YouTube video features wealthy Americans discussing carbon on the valves: http://www.youtube.com/watch?v=P1po2XzeXzE
From: Hachiroku ハチロク on 23 Jul 2010 20:05 On Fri, 23 Jul 2010 02:15:14 -0400, JoeSpareBedroom wrote: > "Hachiroku ????" <Trueno(a)e86.GTS> wrote in message > news:4c49090b$0$74748$afc38c87(a)read01.usenet4all.se... >> On Thu, 22 Jul 2010 22:08:48 -0400, JoeSpareBedroom wrote: >> >>> "Hachiroku ????" <Trueno(a)e86.GTS> wrote in message >>> news:4c48df07$0$74748$afc38c87(a)read01.usenet4all.se... >>>> The car in this case is a 1989 Mazda 626. It was running great until the >>>> day before yesterday, and turned 190,000 miles last week. >>>> >>>> AT highway speeds it hesitates only a little bit, unless you start going >>>> up a hill, then it starts sputtering. Normal around town driving, not so >>>> much, unless you're going up a hill in third gear. >>> >>> >>> It means something's not right. >> >> Gee! Uh, thanks, Joe! > > > Go ahead and try to prove that I'm wrong. By golly, this time he's 100% correct!!!
From: Hachiroku ハチロク on 23 Jul 2010 20:07 On Fri, 23 Jul 2010 09:05:19 -0400, Scott Dorsey wrote: > Ray O <rokigawa(a)NOSPAMtristarassociates.com> wrote: >> >>I second the carbon buildup on the valves. Hook up a vacuum gauge, and when >>the problem is occurring, see if vacuum drops. If the Techron doesn't work, >>find a shop with Motor-Vac or that has a way to do the walnut shell blast. > > The original poster mentioned using high-test gasoline in it just because > it was cheap right now. > > If you run enough high-test in an engine designed with fairly low compression, > you're apt to wind up with carbon deposits as a result. > --scott Interesting... I always thought it was just the opposite! This car ran the best on mid-grade. The next fill up I am going to fill it with mid grade. I did so much running the last couple days it's at about a quarter tank now... And another bottle of Techron.
From: Hachiroku ハチロク on 23 Jul 2010 21:10
On Thu, 22 Jul 2010 20:14:11 -0400, Hachiroku ハチロク wrote: > > I'll have to check Mazda's prices...on some parts they're less expensive > than AZ. I'm betting on plug wires crapping out... And they are...Mazda OEM wire set can be found on line from a Mazda dealer for $19.99. AZ ValueCrap wires are $12. DuraCrap wires are $26. Denso (Toyota's OEM vendor) are $22 and NGKs are $26. I can't remember what I used (they were AutoZone) but I don't think they were ValueCraft... |