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Subject: Any auto mechanics out there? rss

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Justin Moore
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I have a 85 300zx that is really rough when the engine is cold but runs great when it's warm. I've done all the normal tune up stuff but it hasn't helped. Anyone out there have a similar experience with a resolution they could pass along?

I'm trying to avoid the $95/hr mechanic!
 
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Steve Vondra
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Don't drive like my brother!
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Kendrick Martin
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cooler king wrote:
Don't drive like my brother!


Don't drive over my brother.

In all serious, my guess is that the car is just getting worn out. The parts get loose when they're cold and expand to fit tight when it heats up.
 
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George Kinney
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Could be a number of things. A few auto part places will pull your engine trouble codes for you (Autozone does locally) so you can narrow it down.

Super rough guess would be the engine coolant sensor.

 
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pronoblem baalberith
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feydjm wrote:
I have a 85 300zx that is really rough when the engine is cold but runs great when it's warm. I've done all the normal tune up stuff but it hasn't helped. Anyone out there have a similar experience with a resolution they could pass along?

I'm trying to avoid the $95/hr mechanic!


It could be a number of things. O2 sensor, catalytic converter, coolant temperature sensor, mass air flow sensor (MAF), throttle position sensor (TPS), thermostat, fuel injectors...

If you can find the TPS, MAF and coolant temp sensors cheap enough and you have a shop manual try replacing those and using some fuel additive to clean out the injectors. You might have good results. I had a similar problem with a Mazda and did all of the above... I think it cost ~$100 total for the parts and it took only an hour. It fixed the problem, not sure which of the things did it but at least I had new parts on an old car.

Is it red? I had a red 85 Z.
 
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pronoblem baalberith
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renegaderebel wrote:
In all serious, my guess is that the car is just getting worn out. The parts get loose when they're cold and expand to fit tight when it heats up.


There's your answer. Most likely it's the watchamacallit that is expanding and contracting... once that is worn out it is time to get a new car. This is why you never see cars on the road that are more than 20 years old or have more than 200k miles on them.
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Stephen Dunne
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Well, you could be dealing with a cylinder misfire, or a problem related to your distributor. If it is only a problem when the car first starts, I doubt it is the ignition control module, but that is normally an inexpensive part, and is very easy to swap out (a couple of phillips head screws and a 2 cable connectors).

Past that, I would follow the earlier advice and look into problems with you mass air flow sensor or O2 sensor. Could be that they are not adjusting your fuel/air mix correctly for the engine when it first starts, and then as it warms up they begin to operate correctly.
 
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Kendrick Martin
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pronoblem wrote:
renegaderebel wrote:
In all serious, my guess is that the car is just getting worn out. The parts get loose when they're cold and expand to fit tight when it heats up.


There's your answer. Most likely it's the watchamacallit that is expanding and contracting... once that is worn out it is time to get a new car. This is why you never see cars on the road that are more than 20 years old or have more than 200k miles on them.


Now now, I never suggested getting a new car. I'm just theorizing these things might just be part of the normal wear of a 20 year old car.
 
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Justin Moore
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renegaderebel wrote:
pronoblem wrote:
renegaderebel wrote:
In all serious, my guess is that the car is just getting worn out. The parts get loose when they're cold and expand to fit tight when it heats up.


There's your answer. Most likely it's the watchamacallit that is expanding and contracting... once that is worn out it is time to get a new car. This is why you never see cars on the road that are more than 20 years old or have more than 200k miles on them.


Now now, I never suggested getting a new car. I'm just theorizing these things might just be part of the normal wear of a 20 year old car.


I'd buy this argument if it ran sort of overall crappy, but given how well it runs when it's warm, I don't know.

I just hope it's not the MAF, a reman'd one is $200!
 
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