Hi I have a mk1 mx5 na, and im having a few problems if any one can help I’m new to mx5.
A missfire when engine is cold, the car starts fine and idles fine but if you Rev it a bit it starts to misfires and shakes all over the place both on idle and reving it up. But after a few minutes its fine and can be driven no problem idles good and pulls fine.
It seems to be running rich all the time, quite a bit of white smoke takes a while to clear.
I have checked and replaced lots of things but But no look and now don’t knot were to turn.
Inc new Head gasket Timing belt coil pack ht leads twice Plugs twice o2 sensor ecu temperature sensor
Cleaned afm Cleaned throttle body Pulled injectors out tested them lose in rail spay pattern good on all 4 Checked vacuum hoses Cylinder compression #1 168psi #2 158psi ,#3 171,#4 169psi
No fault codes
Checked all earth points
Fuel cleaner added to tank.
I have no idea where to turn after all that If any one can help that would be amazing as it was suppose to be a xmas present for my wife
Sounds like a faulty Mass Air Flow Meter MAF. if it’s gone no amount of cleaning it will make it right. See if you can swap one over from another MX5 to confirm the issue.
Lot’s going cheap on ebay so it won’t kill your bank balance.
ok I have ordered one off eBay, I did check the signal wires from it and i was getting volts that increase with revs but could be worth a go.
im a bit worried about the amount of white/light grey smoke and water coming out of the exhaust even when warm, it does clear when driving but stop for say 10min and when you start it back up it smokes again. I changed the head gasket fearing that was the cause but now im not sure if its water coming from coolant system or water vaper condensing because its running very rich.