Engine misfire
Discussion
Morning..bit cloudy and light rain forecast for this morning here, but a bit of sun later for a drive I hope. Who's on the road today?
I've been able to get the old girl on a good run a couple of times recently though and blown out the cobwebs a bit but she has now developed a major lurching misfire particularly with sharper acceleration once 90 degrees has hit. Not immediately after 90 but 5-10 mins or so later, ok before this. I dropped into Burtons and bought a new dizzy cap, rotor and leads which I swapped over the other evening and am going to change the fuel filter which hasn't been changed for a bit....I put some redex cleaner in and wonder if its worked a bit of c*** through. This might all solve the problem but wondered if anyone else has had the same issue?
Oh and while I was changing the leads I noticed that Lead positions were opposite to desribed in the Haynes capri and Steve Heath bible, i.e when looking at the distributor and vacuum unit position as being correct its currently 5-1, 6-2, 4-3, 3-4, 1-5 & 2-6 like its 180 degrees out. Always been like this since I've had it, thinking I should maybe look into it and check the timing while I'm at it?
I've been able to get the old girl on a good run a couple of times recently though and blown out the cobwebs a bit but she has now developed a major lurching misfire particularly with sharper acceleration once 90 degrees has hit. Not immediately after 90 but 5-10 mins or so later, ok before this. I dropped into Burtons and bought a new dizzy cap, rotor and leads which I swapped over the other evening and am going to change the fuel filter which hasn't been changed for a bit....I put some redex cleaner in and wonder if its worked a bit of c*** through. This might all solve the problem but wondered if anyone else has had the same issue?
Oh and while I was changing the leads I noticed that Lead positions were opposite to desribed in the Haynes capri and Steve Heath bible, i.e when looking at the distributor and vacuum unit position as being correct its currently 5-1, 6-2, 4-3, 3-4, 1-5 & 2-6 like its 180 degrees out. Always been like this since I've had it, thinking I should maybe look into it and check the timing while I'm at it?
I am no expert but as no-one better qualified seems to have replied I'll put in my 6 eggs.
I had a lurching misfire on mine when hot, usually after cruising at a constant speed or after overrun downhill. I received a number of suggestions from other pistonheaders, all of them valid and gratefully received.
(I dont know how to do links but if you do a search under " TVR s series kangaroo S2" the thread should come up from 01 Nov 2013).
I fitted a new throttle pot and the problem seemed to go away for a while. however it occurred again a month later and I finally cured it by cleaning the tracks on both the airflow meters (using cotton buds and meths) and swopping the connector plug from the bottom AFM to the top one and vice versa. The misfire has not come back since.
Its easy to do so may be worth a try, I hope this helps,
I had a lurching misfire on mine when hot, usually after cruising at a constant speed or after overrun downhill. I received a number of suggestions from other pistonheaders, all of them valid and gratefully received.
(I dont know how to do links but if you do a search under " TVR s series kangaroo S2" the thread should come up from 01 Nov 2013).
I fitted a new throttle pot and the problem seemed to go away for a while. however it occurred again a month later and I finally cured it by cleaning the tracks on both the airflow meters (using cotton buds and meths) and swopping the connector plug from the bottom AFM to the top one and vice versa. The misfire has not come back since.
Its easy to do so may be worth a try, I hope this helps,
Worth mentioning that I had a problem recently with slightly rough running - fine under throttle, but hunting at idle, and come off the throttle and the revs would drop and often die. Cleaned up a couple of engine bay connectors and cleaned out the ICV which was really badly coked up. Done 80 miles since (hooning and stop start traffic) and it hasn't missed a beat. Worth a shout if you find it's doing it off throttle.
TVRees said:
Don,
I've got both airflow meters off at the moment and I'd like to give 'em a good clean before I put them back on again. I was wondering what you meant by "cleaning the tracks". Which tracks do you mean ?
Thanks
sorry, by track I mean the semi circular resistance inside the Airflow meter which measures the position of the vane. The vane has a wiper attached which rubs on the resistance track. On mine the track was dirty so the resistance did not change smoothly as the vane moved.(There are probably proper technical terms for all these parts) I assume that when the wiper passed over the dirt the ECU thought the throttle was closed and shut off the fuel.I've got both airflow meters off at the moment and I'd like to give 'em a good clean before I put them back on again. I was wondering what you meant by "cleaning the tracks". Which tracks do you mean ?
Thanks
If you run a knife round the edge of the plastic cover on the back of the meter (it is held in place by sealant) it can be gently prised off allowing access to the track.
NB; I was told that when resealing this cover I should use silicon sealant specifically intended for electronics as they are non corrosive.
Cheers for the ideas Fellas,
I've not actually managed to take it out yet since working on it, but while I was changing the fuel filter I noticed coolant leaking from the water pump and consequently a low level so I reckon that was the issue or at least that and a combination of the other items I changed. New pump now I guess.
I'm in the middle of changing the rear hood section at the minute, just need to glue to the top hoop and trim, I already did the targa's a few weeks back, although I think I paid too much for the material and hood section. Then again I think I paid too much for thd car bearing in mind what they are selling for and the condition I bought mine in, I actually looked at one close to me but turned it down as it had no MOT and it was the first I saw ( a much much better buy in hindsight)....then I went and bought mine because I travelled miles to see it and felt compelled to....never a good idea especially when I knew bugger all about the S in reality...still its getting there even if I'm having to renew just about everything in sight...and out to be fair.
Phil
I've not actually managed to take it out yet since working on it, but while I was changing the fuel filter I noticed coolant leaking from the water pump and consequently a low level so I reckon that was the issue or at least that and a combination of the other items I changed. New pump now I guess.
I'm in the middle of changing the rear hood section at the minute, just need to glue to the top hoop and trim, I already did the targa's a few weeks back, although I think I paid too much for the material and hood section. Then again I think I paid too much for thd car bearing in mind what they are selling for and the condition I bought mine in, I actually looked at one close to me but turned it down as it had no MOT and it was the first I saw ( a much much better buy in hindsight)....then I went and bought mine because I travelled miles to see it and felt compelled to....never a good idea especially when I knew bugger all about the S in reality...still its getting there even if I'm having to renew just about everything in sight...and out to be fair.
Phil
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