Low rev stutter under load
Low rev stutter under load
Hi all,
My fasty has been running well however developed a low revs stutter but not originally on every drive. Needed a bit of a tune up so took it to my mechanic and told him. He just reset the carbs, valves, timing and has driven perfect all week then started up to drive home from work today and was stuttering again. Drives fine through the revs but low down in slow traffic very annoying! It’s popping on the exhaust more than normal and notice the idle drops when it’s like this too when it normally more positive when ok.
Going to give it a rest for a few days and be interested to see if it runs normal again. However just seeing if anyone has any suggests as to what it can be or has experienced this before?
Any help would be great. Thank you
My fasty has been running well however developed a low revs stutter but not originally on every drive. Needed a bit of a tune up so took it to my mechanic and told him. He just reset the carbs, valves, timing and has driven perfect all week then started up to drive home from work today and was stuttering again. Drives fine through the revs but low down in slow traffic very annoying! It’s popping on the exhaust more than normal and notice the idle drops when it’s like this too when it normally more positive when ok.
Going to give it a rest for a few days and be interested to see if it runs normal again. However just seeing if anyone has any suggests as to what it can be or has experienced this before?
Any help would be great. Thank you
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Low rev stutter under load
Sounds like it could be an excessive gap on the plugs. Do you know if the points were checked prior to adjusting the timing ?
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Low rev stutter under load
Hi 937, yes points were checked too. Points and condenser only 2 weeks old and all ok. Possibly thinking could be a fuel filter problem but doesn’t seem like it..
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Low rev stutter under load
How are the spark plugs ?
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Low rev stutter under load
Just because a condenser is new doesn't mean its ok. I've had a couple of knackered ones out of the packet. Always worth revisoting newly installed parts
The sultan of swing
Re: Low rev stutter under load
It actually started to do it briefly before I changed the points and condenser thinking about it. It’s inconsistent drove it yesterday for a short trip after being sat for 2 days and had no problems at all but know before long it’ll start hesistating again.
Sorry 937 the mechanic didn’t check the plugs so think that’ll be my job tomorrow check the gaps etc. Just one of those annoying ones, must be a minor issue creeping in somewhere!
Sorry 937 the mechanic didn’t check the plugs so think that’ll be my job tomorrow check the gaps etc. Just one of those annoying ones, must be a minor issue creeping in somewhere!
Re: Low rev stutter under load
So update on this. Checked spark plug gaps and all were fine. Looked at fuel filter and it pretty dirty was some rusty fuels swishing around in it. Changed it over and seems to be all good and idling as it was. However looked under to see if any leaks but noticed a bit of rusty fuel had already spirted into the filter not much though. So maybe some rust from the chassis line has dislodged as fuel tank has been recoated who know. Will keep and eye on this and might replace again soon.
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Low rev stutter under load
Was the tank re-coated on the inside - more likely to be corrosion on the inside of the tank than pipes, especially if the car has been stored for a while with little fuel in it.
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Low rev stutter under load
Was sat for a long time before I bought it hope recoated tank on the inside, I’ve had it running for a year or so now. Kept original metal fuel as seemed fine after blowing it out so need to see where this is coming from..
Re: Low rev stutter under load
Stumble has come back, drives great through the rev range never had trouble with this before!!&))!&@!! In the process of emiliniation. Cheers
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Low rev stutter under load
Getting into an area that's not my strong point...carbs. Could there be bits of grit causing blockages in the idle jets ?
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
- purplepeter
- Posts: 2339
- Joined: 8th August 2006 - 4:41pm
- Location: Bath, Avon
Re: Low rev stutter under load
Check the connections to the balance pipe are all nice & tight
Also, whilst You're there, check the vacuum pipe to distributor
And also, Check the connections & that the Cut off vales are tight
Also, whilst You're there, check the vacuum pipe to distributor
And also, Check the connections & that the Cut off vales are tight
Re: Low rev stutter under load
Right you’re proberly getting sick of hearing from me but quick update. Changed spark plugs in lunch break from Bosch to Ngk’s runs better, checked connections etc all seems ok wriggled them a bit tighter. Anyway still stuttered 90% of the drive home then suddenly came good again and stayed good whole drive to work next day so starting to think a bit of dirt was/is floating around the carb and blew itself out so that next step if that happens again will clean carbs. Thanks for all your help guys
- 937carrera
- Posts: 1190
- Joined: 7th June 2013 - 11:54pm
- Location: North Yorkshire
Re: Low rev stutter under load
Sounds good
Have another check on the fuel filter and change again if it's looking dirty, try to stop the problem recurring.
Have another check on the fuel filter and change again if it's looking dirty, try to stop the problem recurring.
David
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
1974 412LS Variant
1973 412LE 4 door Fastback / Saloon
Re: Low rev stutter under load
Will do, thanks again