Warm start problems
Discussion
Has anyone ever come across the problem of their 2.8 wedge dying when it gets up to running temp????
As i understand it, the fueling system is a Bosch K-Jetronic, previously fitted to the MKII Granada. I have read all the bumf i can find on the net and narrowed it down to either:
1. Faulty airflow meter
2. warm start relay
The puzzling thing about it is, that it was running great until i did some work behind the radio and something sparked when i started it up after.
It reached running temp and started to run lumpy on tickover and then as soon as you try to rev the engine, it cut out and would not restart. let it cool down and it starts first time, every time.
any input would be gratefully recieved
As i understand it, the fueling system is a Bosch K-Jetronic, previously fitted to the MKII Granada. I have read all the bumf i can find on the net and narrowed it down to either:
1. Faulty airflow meter
2. warm start relay
The puzzling thing about it is, that it was running great until i did some work behind the radio and something sparked when i started it up after.
It reached running temp and started to run lumpy on tickover and then as soon as you try to rev the engine, it cut out and would not restart. let it cool down and it starts first time, every time.
any input would be gratefully recieved
You probably don't have a problem at all, parts that is.
As you engine warms up the Aux air thingy closes, reducing air flow to the plenum.
The main source of air into the plenum is past the butterfly, but there is a small bypass that has a screw adj. in it.
It is facing the front of the car, you will have to strech your neck a bit to see it. It about a 1/3inch in diam, biggish.
Do not adj the stop nut on the butterfly, this is a factory setting (so that somebody does not under adj and have a sticking butterfly.)
Give it half a turn anti clock. warm up engine then adj for correct idle 850/900 or so.
Jeff
As you engine warms up the Aux air thingy closes, reducing air flow to the plenum.
The main source of air into the plenum is past the butterfly, but there is a small bypass that has a screw adj. in it.
It is facing the front of the car, you will have to strech your neck a bit to see it. It about a 1/3inch in diam, biggish.
Do not adj the stop nut on the butterfly, this is a factory setting (so that somebody does not under adj and have a sticking butterfly.)
Give it half a turn anti clock. warm up engine then adj for correct idle 850/900 or so.
Jeff
If that isn't it, post again.
The Fuel inj on these cars is pretty mechanical, air flow lifts a sort of baffle type thing that is attacthed to a needle valve which regs the gas.
This is the moderated by a WUR (warm up reg).
So any sparking activity that you caused under the dash is prob not the cause.
The Fuel inj on these cars is pretty mechanical, air flow lifts a sort of baffle type thing that is attacthed to a needle valve which regs the gas.
This is the moderated by a WUR (warm up reg).
So any sparking activity that you caused under the dash is prob not the cause.
well wouldn't you believe it??? The bloody thing started first time every time when cold, but since i got a few ideas of what might be wrong with it, it has decided not to start at all.
I'm sure there is more to these TVR's than mechanical bits and pieces, a gremlin that knows what your going to do and makes something else go wrong???
Going to have to go back to basics, might just install some carbs on it???
I'm sure there is more to these TVR's than mechanical bits and pieces, a gremlin that knows what your going to do and makes something else go wrong???
Going to have to go back to basics, might just install some carbs on it???
Ok just went out to it, put a spark plug onto one of the HT leads, and the thing started?????? was cranking it the other day for about 10 minutes with no joy??? one thing i did notice was the extra sound of sucking air on starting cold, the piping comes from near the throttle body, passes through, what i think is the warm start regulator and then into the manifold where the cold start injector is housed. Is this normal???
I think you are refering to the Aux Air Device.
It is sort of bolted on to the front of the plenim, has one hose from near the butterfly (IN) and a hose from it to the right side of the plenum. And Yes if the engine is cold air will and should pass through it, although I've never really listened to it.
Warm up reg is different, that regulates the control pressure. I advise you to stay away from that at present. Just check the Aux air device. Pull off the two hoses and look through it. Engine hot, there should be a plate across shutting off the air. Engine cold, you should be able to see through it (almost) shine a torch thro' it.
Jeff
It is sort of bolted on to the front of the plenim, has one hose from near the butterfly (IN) and a hose from it to the right side of the plenum. And Yes if the engine is cold air will and should pass through it, although I've never really listened to it.
Warm up reg is different, that regulates the control pressure. I advise you to stay away from that at present. Just check the Aux air device. Pull off the two hoses and look through it. Engine hot, there should be a plate across shutting off the air. Engine cold, you should be able to see through it (almost) shine a torch thro' it.
Jeff
OK checked what you said, as you said and it does what you say it should do???
Whats next on the agenda???? i have lots of time to kill, as i'm recovering from bike accident, so as long as the rain keeps off and it's not too cold this gives me something to do.
Thanks for your time and info by the way.
Rich
Whats next on the agenda???? i have lots of time to kill, as i'm recovering from bike accident, so as long as the rain keeps off and it's not too cold this gives me something to do.
Thanks for your time and info by the way.
Rich
Assuming you adjusted up the idle a bit and it still stalls when hot.
Take the wires off the warm up reg and see if it still stalls when it gets hot.
The WUR ops in two ways, from a bi metal strip heated by electric current and from manifold vacuum.
While it's running try spraying WD40 or similar to check for a change of engine note, this would signify a vac leak possibly in diaphram in WUR.
Jeff
Take the wires off the warm up reg and see if it still stalls when it gets hot.
The WUR ops in two ways, from a bi metal strip heated by electric current and from manifold vacuum.
While it's running try spraying WD40 or similar to check for a change of engine note, this would signify a vac leak possibly in diaphram in WUR.
Jeff
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