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1990 Mazda MX5 the engine started missing

Tiny
GOOFBALLLOVERS
  • MEMBER
  • 1990 MAZDA MX5
Noises problem
1990 Mazda MX5 4 cyl Two Wheel Drive Manual

Last Sunday it ran beautiful, Monday morning I drove it to my Dr.S appointment, it was missing on the way there and has not stopped yet. We have changed the spark plugs, checked the wires(all are firing) and have pulled the cover on the engine all the lifters are working under the cover what else can be causing the missing, should we pull the injectors?
Wish we could afford a donation, but with my doctor bills and surgery bills we don't have much left. Wish it could be more than what I am sending.
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Monday, July 26th, 2010 AT 2:20 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Before any more parts do a compression test then post results will advise. Also to Identify cylinder pull plug wire one at time see if RPM change is same on all
Let me know
Thanks for donate
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Monday, July 26th, 2010 AT 2:32 PM
Tiny
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My dad was able to get a compression checker and we checked each of them showed 25-50 pounds of compression. We thought it should be more or are we wrong? Going to check for vacume leaks Thursday weather premitting.
Thank you!
Amy Cross
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Wednesday, July 28th, 2010 AT 5:58 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Compression must be 145 psi+ a possibility maybe Timing belt may have jumped see diagram


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_532.jpg


if belt is offf then compression is low and will miss.
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Thursday, July 29th, 2010 AT 1:41 PM

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