I had a couple of issues with mine (not all the same time though)
1st was the rubber hose from the AFM to the throttle body had a crack underneath so I couldn't see it but when I revved the engine the crack would become larger and cause issue, a new rubber hose solved that.
2nd the track inside the AFM had worn out causing similar issues. Solution- Open up AFM and reposition the circuit board a little so a new track was swept
3rd Warped door-solution as others have mentioned
Stumble and miss in my '80
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divace73
- Posts: 1380
- Joined: Sun Oct 17, 2010 5:59 am
- Your car is a: 1980 Fiat 124 Spider Silver
- Location: Sydney, Australia
Re: Stumble and miss in my '80
Cheers David
-=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<<
-=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<<
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cyclemichael
Re: Stumble and miss in my '80
Yeah I have scoured the hose from AFM to Throttle but haven't found/felt anything. But for around $30 it probably could't hurt to replace. Ill open up the AFM hopefully soon to see whats going on in there.
Another thing I want to do is check my cap to see if any wires are rubbing or worn.
I've got a new fuel filter on the way so hopefully after I've run my checklist of potential problems, I'll have found a fix!
So far my list is:
-Check AFM for free motion/ wear.
-Replace fuel filter
-Ensure plenum screws and hose clamps are tight
-Check distributor cap for wear in wires
-Check spark plugs for wear/ correct gap
-Replace lambda sensor (once all else has been looked at)
Anything else I should check for?
Another thing I want to do is check my cap to see if any wires are rubbing or worn.
I've got a new fuel filter on the way so hopefully after I've run my checklist of potential problems, I'll have found a fix!
So far my list is:
-Check AFM for free motion/ wear.
-Replace fuel filter
-Ensure plenum screws and hose clamps are tight
-Check distributor cap for wear in wires
-Check spark plugs for wear/ correct gap
-Replace lambda sensor (once all else has been looked at)
Anything else I should check for?
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cyclemichael
Re: Stumble and miss in my '80
So i just spent today fiddling around. I painted a cover (makes a surprising difference), took out my windshield washer bottle (it doesn't work so hopefully I can get it functional), and took off the air hose to check for cracks (nothing I could see). Putting everything back together I made sure everything was fitted tight and check all hoses related to air supply, andf the plenum bolts.
I started her up, as I always do after completing stuff like this to make sure I put it all back together right, and when I started it, voila! She idled smoothly at around 900rpms ( I know, a little high, but still a victory). I am so happy that fort the first time in more than a month I felt her run smooth. No telling what will happen tomorrow, but at least I know she's capable of it.
I still have a new fuel filter coming in. And I'll still replace the lambda, if it still runs smooth.
I started her up, as I always do after completing stuff like this to make sure I put it all back together right, and when I started it, voila! She idled smoothly at around 900rpms ( I know, a little high, but still a victory). I am so happy that fort the first time in more than a month I felt her run smooth. No telling what will happen tomorrow, but at least I know she's capable of it.
I still have a new fuel filter coming in. And I'll still replace the lambda, if it still runs smooth.
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narfire
- Posts: 3959
- Joined: Sat Dec 27, 2008 2:14 am
- Your car is a: 1980 124 spider
- Location: Naramata B.C.
Re: Stumble and miss in my '80
Sounds promising...
A couple of other issues I've had over the years.... A plug lead from the dist had worn from contact with the hood or hood pad and was arcing. I noticed when the hood was down(low) and the carport was dark. This caused a stumble/miss compared to when the car was running well.
The other was I had replaced the plugs with a new set and again there was a stumble so the same dark carport showed an arc between a bad/cracked plug and the head.
Just another think to check I suppose..
Chris
A couple of other issues I've had over the years.... A plug lead from the dist had worn from contact with the hood or hood pad and was arcing. I noticed when the hood was down(low) and the carport was dark. This caused a stumble/miss compared to when the car was running well.
The other was I had replaced the plugs with a new set and again there was a stumble so the same dark carport showed an arc between a bad/cracked plug and the head.
Just another think to check I suppose..
Chris
80 FI spider
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box
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cyclemichael
Re: Stumble and miss in my '80
Okay so the stumble came back. It stayed away for a little while but has come back now. I will be checking the hoses again and probably replacing them, since it seems that one is loose, or has a hole. Hopefully this is actually the problem. I do think it is because it was running just about perfectly for that one day or so.
The work doesn't seem to end, but I'm not complaining!
The work doesn't seem to end, but I'm not complaining!