Hesitation at Low RPM

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02-02-2008, 01:29 PM
flyin94m

Hesitation at Low RPM

I'm hoping that someone here has seen this before. I recently acquired my 1991 and started driving it. All in all, it's not bad. It idles beautifully, it has smooth acceleration from about 2500-6000 RPM, but for some reason at about 1/2 to WOT between 1000 and 2000 RPM the engine hesitates/hiccups/whatever.

Since I just picked up the car and have a fairly good idea about the prior maintanence, I figured I would start with the obvious by checking/replacing plugs and wires.

Does anyone else have other ideas about what I should look for?
02-02-2008, 01:50 PM
sammm

Plugs and wires is a good place to start. Change those and report back. Fuel filter wouldn't hurt either.
02-02-2008, 04:19 PM
Nexus Flux

A little Seafoam treatment might also be in order. I'd say do the Seafoam first and then put in some fresh plugs.

Also check for any vacum leaks as the hoses might be getting old and brittle.
02-02-2008, 06:19 PM
Dave04

Quote:

Originally Posted by Flyin94m

Currently:
1991 Mariner Blue (daily driver)

Hey look! It's one of those RARE Mariner Blue Miata's!
02-02-2008, 06:22 PM
Treibenschnell

Quote:

Originally Posted by Dave04

Hey look! It's one of those RARE Mariner Blue Miata's!

:clap:
02-02-2008, 06:30 PM
Rogue

Get a set of NGK blue wires and NGK plugs then add a bottle of Techron Concentrate to a full tank of good gas.
Go out and run the dog out of it for a bit.

That just fixed two up this week.
Lady thought it was gonna be expensive. ;)
02-04-2008, 11:59 AM
flyin94m

All seem like good suggestions. As is, I started with NGK plugs and new wires. It seems that the problem disappeared -- for now. I wonder if weather might have some sort of effect. It's running fine in this 70+ degree weather. I'll wait until Wednesday morning before I decide my problem is fixed.

Regardless, some of the other suggestions (vacuum leaks, fuel filter, seafoam, etc) all sound like just plain good sense. So I'll probably get to those in the coming weeks.

Thanks for the help. I'll let you know on Wednesday whether my problem is gone or not.
02-04-2008, 12:15 PM
Rogue

Seafoam = Tons of smoke ::Bust1::

Techron concentrate = just pour it in and :drive:

If you need anything let me know, i'm right down 407.
02-05-2008, 09:22 AM
Magma

Quote:

Originally Posted by Rogue

Seafoam = Tons of smoke ::Bust1::

But it is soooo much fun to block the view on all 6 lanes of Coit
02-06-2008, 10:05 AM
flyin94m

Quote:

Originally Posted by Flyin94m

Thanks for the help. I'll let you know on Wednesday whether my problem is gone or not.

It's Wednesday. She still runs happy :)