acceleration issue under 2000 rpm

Asked by Aug 21, 2013 at 08:48 PM about the 1990 Mazda MX-5 Miata Base

Question type: Maintenance & Repair

My 1990 mazda miata will not accelerate sumtimes under 2000 rpm, it is like it is under a
heavy load. When this happens you can push the clutch in and the throttle seems to
come back to normal, release the clutch and the problem may or may not return. You can
slip the clutch to get going and most of the time the problem goes away. I have
elliminated the cat and there was no change, so it's not a back pressure issue, some
suggested the mass air flow is having problems. Oh new ngk plugs, wires, pcv, air filter,
fuel filter, fluids were all changed and a new clutch kit was installed.

6 Answers

suspect a vacuum leak~ wave an unlit propane torch over the engine to pinpoint the leaker~

22,535

My 1990 miata had the same issues, I too thought mine was the mas air flow flapper. It ended up being I had the dreaded short nose crank failure. I got lucky I was able to get it repaired without tearing apart the motor. The 90 was really the only year this was a problem for the Miata since Mazda installed a long nose crank for 91 and up Miatas. Heres a link on what to looks for: http://www.youtube.com/watch?v=SzMkywE2NXE

3 out of 3 people think this is helpful.
22,535

Heres another link with more info: http://www.miata.net/garage/hsue/crank/loctite_1.htm

1 out of 1 people think this is helpful.

wow Mr. Kane, I had no idea...a simple design not considering the harmonics would actually make the bolt come loose and the keyway jostle around until breakage~~whew, am sure glad I didn't have one of those...what I did have was a BENT crank that I'd have never spotted until after installation...had to sell the truck...it was an Impala 400 engine~....in a 1966 Chevy C10 sold it to a plumber in Marin Co.~....for five hundred dollars~

Michael Kane, You have a rather impressive garage of cars that you've owned. I've had like more than 26...not counting the fifty dollar SALT beaters to get through winter~

22,535

Thanks Roy, I have been slowly adding all the cars Ived owned / driven / want. My wife and I have owned 13 Miatas over the years, I kinda have a soft spot for them. I noticed your classic benz you owned, i had a friend with the same car ( probly why I like Mercedes so much, lol ) I have fond memories.

Your Answer

Add photo

Related Questions

MX-5 Miata

Looking for a Used MX-5 Miata in your area?

CarGurus has 4,461 nationwide MX-5 Miata listings starting at $2,300.

ZIP:

Search Mazda MX-5 Miata Questions

Mazda MX-5 Miata Experts

#1 Michael Kane
Michael Kane
Reputation 1,840
#2 Tom Demyan
Tom Demyan
Reputation 1,090
#3 Racer_X
Racer_X
Reputation 380
View All

Related Models For Sale

Used Ford Mustang
724 Great Deals out of 38,166 listings starting at $1,750
Used Chevrolet Corvette
358 Great Deals out of 20,118 listings starting at $3,688
Used BMW 3 Series
1,767 Great Deals out of 40,386 listings starting at $1,350
Used Chevrolet Camaro
664 Great Deals out of 38,931 listings starting at $2,995
Used Honda Civic
1,130 Great Deals out of 63,726 listings starting at $995

Used Cars For Sale

2016 Mazda MX-5 Miata For Sale
13 Great Deals out of 2,807 listings starting at $19,477
2015 Mazda MX-5 Miata For Sale
11 Great Deals out of 171 listings starting at $14,888
2014 Mazda MX-5 Miata For Sale
7 Great Deals out of 114 listings starting at $13,912
2013 Mazda MX-5 Miata For Sale
5 Great Deals out of 139 listings starting at $13,980
2012 Mazda MX-5 Miata For Sale
9 Great Deals out of 116 listings starting at $11,995