Bought a 1991 MX-5 (Eunos) needs work
Discussion
It's not a huge job, but will require a new rocker cover gasket. I'd also recommend getting a CAS o-ring from Mazda, as they tend to leak onto one of the heater matrix hoses and cause them to split.
It took me around 1.5 hours to drain the coolant, remove the CAS to replace the o-ring, fit two heater matrix hoses and refill the cooling system. I'd imagine qualified mechanics would be quicker.
It took me around 1.5 hours to drain the coolant, remove the CAS to replace the o-ring, fit two heater matrix hoses and refill the cooling system. I'd imagine qualified mechanics would be quicker.
Ok so the update is:
CAS is working fine, Temp sensor is fine. So what next? Hmm well I am leaving it with the garage ( I can't trust it to get me to where I need to be) but need to have a good think on what the heck to problem is...
Clogged fuel injectors?
Idle control sensor?
The main problem is it behaves 3 times in 5 but when it plays up there is black smoke rough engine and stalling. The little sod is not doing it when at the garage!
I am at a loss and getting a little desperate now.
CAS is working fine, Temp sensor is fine. So what next? Hmm well I am leaving it with the garage ( I can't trust it to get me to where I need to be) but need to have a good think on what the heck to problem is...
Clogged fuel injectors?
Idle control sensor?
The main problem is it behaves 3 times in 5 but when it plays up there is black smoke rough engine and stalling. The little sod is not doing it when at the garage!
I am at a loss and getting a little desperate now.
MX-5 Lazza said:
If it's not doing it for them at the garage, how can they be sure the CAS & Temp Sensor are fine? It looks like it's an intermittent problem so they would only be able to detect it while it is being problematic...
Good point. I am off to see them on Saturday. I'll raise this.So car back and runs great after idle control valve was found to be in a bit of a gunky state! Car runs beautifully for a good long test run (Lots of stop starts, 30MPH zoness and faster zones to test out. So we stop for a spot of lunch!
1 hour later the car starts and tries to stall, in fact we manage to keep running but engine is surging again, and runs horrible for 3 miles and then all issues stop and runs fine again.
The main issue is the car won't play up when at the garage so they are scratching their heads. They say the CAS and temp sensor are fine but then they can't test them when the problem is actually happening. So I can't decide if I should just get them changed. I have heard a whisper of the fuel injector....more money! Just as a cheap "help I am at a complete loss as to what next" have put in some redex to see if that helps. I am almost 85% now that this is a fuel issue.
I can't wait to update this with good news.
1 hour later the car starts and tries to stall, in fact we manage to keep running but engine is surging again, and runs horrible for 3 miles and then all issues stop and runs fine again.
The main issue is the car won't play up when at the garage so they are scratching their heads. They say the CAS and temp sensor are fine but then they can't test them when the problem is actually happening. So I can't decide if I should just get them changed. I have heard a whisper of the fuel injector....more money! Just as a cheap "help I am at a complete loss as to what next" have put in some redex to see if that helps. I am almost 85% now that this is a fuel issue.
I can't wait to update this with good news.
Doesn't sound like an injector problem.
I'd try replacing the CAS. You can get a known-good 2nd hand one from Autolink relatively cheaply. I wouldn't buy "new".
p.s. is the floor dry under (and I mean under, dry carpet means nothing) the carpet in the passenger foot-well, right down where the passenger feet would be?
I'd try replacing the CAS. You can get a known-good 2nd hand one from Autolink relatively cheaply. I wouldn't buy "new".
p.s. is the floor dry under (and I mean under, dry carpet means nothing) the carpet in the passenger foot-well, right down where the passenger feet would be?
Excuse my ignorance, as you have guessed I am not a mechanic! but if there were damp in the footwell then what is this going to cause apart from the obvious rot?
I will have a look when I get back and feel around. My manual has turned up today but I can't locate this symptom in the trouble shooting.
I will have a look when I get back and feel around. My manual has turned up today but I can't locate this symptom in the trouble shooting.
The ecu is located in the passenger footwell, under a steel plate (it's the reason why the passenger footwell isn't as deep as the drivers footwell). If there is much damp in this area the ecu can be affected and this can cause all manor of odd and often very difficult to analyse problems.
Gassing Station | Mazda MX5/Roadster/Miata | Top of Page | What's New | My Stuff