1990 Mazda MX5 the engine started missing

1990 MAZDA MX5
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GOOFBALLLOVERS
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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.
Jul 26, 2010 at 2:20 PM
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DOCFIXIT
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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
Jul 26, 2010 at 2:32 PM
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GOOFBALLLOVERS
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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
Jul 28, 2010 at 5:58 PM
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DOCFIXIT
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Compression must be 145 psi+ a possibility maybe Timing belt may have jumped see diagram


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

if belt is offf then compression is low and will miss.
Jul 29, 2010 at 1:41 PM
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