I have a Mazda Miata,2000. It stumbles and occasionally misses on acceleration,just off idle. I have replaced timing belt,spark plugs,plug wires,coil packs,catalytic convertor,upstream and downstream O2 sensors. what can be causing the stumble and miss?

Asked by migration_wallyHD Jun 14, 2015 at 07:52 AM about the 2000 Mazda MX-5 Miata SE

Question type: Maintenance & Repair

initially,the car missed and brought up a code for an engine miss. I replaced spark plugs,wires,and coil packs,since all were original. the miss continued,excess gas in cat convertor damaged the convertor. I replaced it and both O2 sensors. there is no OBDII code showing now,yet,but a stumble and miss on acceleration just as I leave idle or low engine speed causes loss of power

12 Answers

65,510

Did you replace air filter and clean throttle body and change fuel filter if have not done so in a while ?

new air filter,new fuel filter,sprayed throttle body. If anything,the stumble/miss is more pronounced. I had to disturb the throttle position sensor to clean the throttle body. maybe that is the problem??

the stumble became more frequent and pronounced after i sprayed the throttle body. I removed TB,took throttle position sensor off to isolate it from the spray. whatever it is,it is getting worse

65,510

Clean throttle body again but this time use a old tooth brush to clean inside of throttle body while holding open choke and also use a micro fiber cloth and wipe the place were the choke sets when it is closed.

I cleaned TB again,per your advice. when i went to restart car,battery died. low voltage may be the culprit. i doubt I'll find a battery for a Miata on Sunday

46,415

Have you checked your idle control valve or idle air control located under the throttle body they tend to cause stalling, irratic idle, and idle droop on decel.

1 people found this helpful.

I removed the IAC,sprayed it with cleaner. I had done this with success on Ford 3.0 V6 engines. it made no difference. the problem is getting worse. I discovered a dead cell in the battery,installed a new one. sometimes low voltage affects electronics,but it made no difference. The car stumbles on rapid acceleration,misses,especially coming off low RPMs. I checked the wiring connections to the camshaft position sensor also

1 people found this helpful.

Your Answer:

MX-5 Miata

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

CarGurus has 65 nationwide MX-5 Miata listings starting at $7,995.

Postal Code:

CarGurus Experts

  • #1
    Michael Kane
    Reputation
    3,350
  • #2
    Cyril Muckenhirn
    Reputation
    580
  • #3
    Nitro_408
    Reputation
    530
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Corvette
28 Great Deals out of 1,058 listings starting at $15,871
Used Ford Mustang
65 Great Deals out of 1,258 listings starting at $4,995
Used Honda Civic
176 Great Deals out of 3,690 listings starting at $1,995
Used Chevrolet Camaro
16 Great Deals out of 307 listings starting at $9,995
Used Honda S2000
18 listings starting at $19,995
Used Toyota Supra
62 listings starting at $51,977
Used Lexus IS
18 Great Deals out of 305 listings starting at $6,449
Used Porsche Boxster
4 Great Deals out of 50 listings starting at $12,643
Used BMW 3 Series
71 Great Deals out of 1,168 listings starting at $1,795

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.