Hi guys,
1981 FI 2000.
The car starts fine, and then as it warms up the idle drops very low to almost a stall (sometimes it does stall). After it has warmed up, it runs a LITTLE rough with some "puff" noises coming from the exhaust.
The car recently had a tune-up which included plugs/wire/cap/filter/fuel pump.
Any and all help would be greatly appreciated.
Regards,
Todd
Starts fine and idles when cold. Then runs a little rough.
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- Patron 2022
- Posts: 4211
- Joined: Thu Jan 10, 2008 8:32 pm
- Your car is a: 1982 2000 Spider
- Location: Granite Falls, Wa
Re: Starts fine and idles when cold. Then runs a little rough.
When you did the tune up were you able to set the idle according to the manuals?
It doesn't sound like a problem that can be pinpointed to any particular component, so a couple of things you may want to check; is the AAR (auxilliary air regulator) closing when it warms up? Check for any obvious breaks or wear spots on the resistance track in the AFM. Sometimes cleaning it with rubbing alcohol will help it make better connectivity. When it's warmed up and running rough unplug the cold start valve, could be it's stuck in the open position. As always, make sure you have no air leaks in the intake components (boot, AAR branch plumbing, intake plenum.)
Good luck, let us know how you're doing with it.
Ron
It doesn't sound like a problem that can be pinpointed to any particular component, so a couple of things you may want to check; is the AAR (auxilliary air regulator) closing when it warms up? Check for any obvious breaks or wear spots on the resistance track in the AFM. Sometimes cleaning it with rubbing alcohol will help it make better connectivity. When it's warmed up and running rough unplug the cold start valve, could be it's stuck in the open position. As always, make sure you have no air leaks in the intake components (boot, AAR branch plumbing, intake plenum.)
Good luck, let us know how you're doing with it.
Ron
Re: Starts fine and idles when cold. Then runs a little rough.
Hi Ron,
Could you explain to me exactly what the Air Flow Meter does (besides the obvious) ? Does it have any other functions?
Regards,
Todd
Could you explain to me exactly what the Air Flow Meter does (besides the obvious) ? Does it have any other functions?
Regards,
Todd
- divace73
- Posts: 1380
- Joined: Sun Oct 17, 2010 5:59 am
- Your car is a: 1980 Fiat 124 Spider Silver
- Location: Sydney, Australia
Re: Starts fine and idles when cold. Then runs a little rough.
In the AFM housing, the unit is responsible for 3 thingstfitzgerald wrote:Hi Ron,
Could you explain to me exactly what the Air Flow Meter does (besides the obvious) ? Does it have any other functions?
Regards,
Todd
1. Measuring Air flow via a tensioned flap which swipes a track with different resistance levels
2. Turning on the Fuel pump when there is movement on the flap (caused buy the suction from the engine)
3. Air temp sensor to measure the Air temp for the system.
Cheers David
-=1980 silver Fiat 124 Spider=-
If you want to see pics of my car (and other random stuff) >>click here<< OR
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-=1980 silver Fiat 124 Spider=-
If you want to see pics of my car (and other random stuff) >>click here<< OR
see my >>You tube channel<<