Misfiring - again

A place to showcase your pride and joy

Moderators: eastlmark, BIG_MVS, Test Moderator

User avatar
User

paulrob100

Rank

Non Member

Posts

383

Joined

Sat May 02, 2015 9:20 pm

Location

Nottingham


Has thanked: 6 times
Been thanked: 12 times

Misfiring - again

Postby paulrob100 » Sun Jul 12, 2020 8:44 pm

I took my GTA out today for the first time in several months. The last time it was out it behaved itself. I have had a misfire issue in the past but it seems to have been sorted.

Anyway, once warmed up & the car seemingly running ok. It decided to misfire when accelerating. Gentle application of the accelerator was fine, but when pressing a bit harder, there it was, together with the speedo fluctuating, which again I thought I'd sorted.
My first thought was damp in the distributer but the car has been kept in a dry garage, & that shouldn't affect the speedo anyway, should it ?? My next thought was bad earths. Could this be the problem ? where about is the engine to subframe earth please ? & is there a main battery earth feed to the rear subframe ? or is it earthed through the chassis backbone to the battery ?

Cheers .
La Plastique Fantastique :GTA
User avatar
User

stephendell

Rank

Club Member

Club Member
Posts

7462

Joined

Wed Apr 14, 2004 7:25 pm

Location

London


Has thanked: 125 times
Been thanked: 102 times

Re: Misfiring - again

Postby stephendell » Tue Jul 14, 2020 9:21 pm

Still worth checking the dizzy cap as they can mysteriously condensate.

There is a technical bulletin which includes several earth additions. Will
See if I can find it and photo.
Trafic, Twingo GT, Vel Satis Turbo x 2, Clio V6 Proto Ph2, Vel Satis 3.5, Avantime, Alpine A610, GTA Atmo x 3, GTA Turbo x 3, R5 Gordini Turbo Mid Engine, Alpine A310 4cyl, Alpine A110, Yellow Smart
no avatar
User

AndyClark

Rank

Non Member

Posts

118

Joined

Sat Dec 11, 2004 11:41 am

Location

Birmingham


Has thanked: 0 time
Been thanked: 2 times

Re: Misfiring - again

Postby AndyClark » Wed Jul 15, 2020 4:33 pm

A couple of years ago, my atmo had a misfire at around 3500rpm. Solved by fitting a new ignition control module (the correct original Bosch one). Found it, via Ebay, through a supplier in France.
User avatar
User

paulrob100

Rank

Non Member

Posts

383

Joined

Sat May 02, 2015 9:20 pm

Location

Nottingham


Has thanked: 6 times
Been thanked: 12 times

Re: Misfiring - again

Postby paulrob100 » Sat Jul 18, 2020 8:50 pm

Thanks for the feedback. As Stephen knows, my car is an early one - 1986. So it might benefit from the revised earth set up.
Anyway, I replaced the ignition module last year, & I have regularly checked / replaced the dizzy cap. I think that condensation is the culprit. I did look at replacing the dizzy drive oil seal as suggested some time ago, but its far from straightforward. Maybe a good run will sort it.
La Plastique Fantastique :GTA
no avatar
User

alpine99

Rank

Non Member

Posts

41

Joined

Mon Sep 13, 2004 10:23 pm

Location

Kent


Has thanked: 0 time
Been thanked: 0 time

Re: Misfiring - again

Postby alpine99 » Sat Jul 18, 2020 9:04 pm

My misfire was solved with a new distributor cap and or brush - something about a worn brush causing the problem, I seem to recall.
Regards
User avatar
User

pgoldsmith

Rank

Club Member

Club Member
Posts

992

Joined

Tue Jul 20, 2004 12:14 pm

Location

West Moors, Dorset


Has thanked: 3 times
Been thanked: 10 times

Re: Misfiring - again

Postby pgoldsmith » Tue Jan 05, 2021 7:06 pm

May be worth checking the idle air control valve?
I believe mine occassionally sticks (open I think) especially if I havent used the car for a while.
I think it can cause hesitation when the car gets warm and a rough idle.
Take it off, spray some carb cleaner inside and it seems to help.

Also, check the connectors going into the ignition module. I disconnect mine, spray switch cleaner on the contacts and re-fit.
GTA Turbo 1991 - Stratos blue


  • Advertisement

Who is online

Users browsing this forum: No registered users and 7 guests

Powered by phpBB ® | Renault' and 'Alpine' are trademarks of Renault S.A.S. or its subsidiaries and are used with kind permission of Renault France