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Author Topic: Starting with a miss-fire, when left overnight  (Read 607 times)

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tunnie

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Re: Starting with a miss-fire, when left overnight
« Reply #30 on: 14 August 2019, 13:31:03 »

I would have to buy all that, plus no time to do it.



Oh.


Back to guessing then.


Good luck

1) itís already been pressure tested, by Serek. (As mentioned in another thread) - Nothing found. Why would I be different with a bodged setup?


2) Iíve bought UV dye kit to help trace the leak.
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Doctor Gollum

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Re: Starting with a miss-fire, when left overnight
« Reply #31 on: 14 August 2019, 13:47:27 »

1. It's possible that the leak wasn't immediately obvious due to the car being cold/hot/heater on/off etc.

2. If you don't have time to run a simple check, how will this help?

Also the only thing that you will find in the passenger footwell is rain water as all the heater connections are on the right ::)

When you say the drivers footwell is dry, did you lift the actual carpet? The insulation underneath will hold  couple of litres easily...
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tunnie

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Re: Starting with a miss-fire, when left overnight
« Reply #32 on: 14 August 2019, 13:50:12 »

As I recall the heater matrix can break and leak into passenger footwell
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Nick W

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Re: Starting with a miss-fire, when left overnight
« Reply #33 on: 14 August 2019, 15:22:56 »

As I recall the heater matrix can break and leak into passenger footwell


You wouldn't be struggling to diagnose a heater matrix leak.
Your nose will tell you what the problem is every time you get in the car.
Even a small leak will soak into the plentiful sound deadening and smell for ages.
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Re: Starting with a miss-fire, when left overnight
« Reply #34 on: 14 August 2019, 15:40:48 »

As I recall the heater matrix can break and leak into passenger footwell
Only when the drivers one is full up.
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Re: Starting with a miss-fire, when left overnight
« Reply #35 on: 14 August 2019, 15:42:13 »

As I recall the heater matrix can break and leak into passenger footwell


You wouldn't be struggling to diagnose a heater matrix leak.
Your nose will tell you what the problem is every time you get in the car.
Even a small leak will soak into the plentiful sound deadening and smell for ages.
Also largely true if it is leaking anywhere near the engine or exhaust  :y
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Re: Starting with a miss-fire, when left overnight
« Reply #36 on: 14 August 2019, 22:30:45 »

Any smoke? From exhaust :D
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Re: Starting with a miss-fire, when left overnight
« Reply #37 on: 19 August 2019, 08:02:10 »

Misfire - jump in it tomorrow. Flow throttle to full kickdown, and crank - it shouldn't start. Crank for a good 5s, and repeat. Then start normally. Improvement? If so, replace injector.

Just did this, it fired up with throttle floored.  :-\

Same problem, miss fire which then cleared.
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Andy H

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Re: Starting with a miss-fire, when left overnight
« Reply #38 on: 19 August 2019, 08:20:58 »

I would have to buy all that, plus no time to do it.



Oh.


Back to guessing then.


Good luck
^^^ this
I made mine using an old Carlton pressure cap and a schrader Valve.

I spent weeks trying to find the coolant loss on my first Omega.  Took about 20 minutes with a test cap and bicycle pump.
If you have any doubt about coolant leaking into no 5 you should leave it pressurised overnight then pull the spark plugs and look for coolant the next morning.
« Last Edit: 19 August 2019, 08:24:39 by Andy H »
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Re: Starting with a miss-fire, when left overnight
« Reply #39 on: 19 August 2019, 08:27:48 »

If you suspect an injector you could swap that injector to a different cylinder to see if the fault moved to that cylinder.

The risk is that 15 year old O rings might not like to be disturbed  :-\
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tunnie

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Re: Starting with a miss-fire, when left overnight
« Reply #40 on: 19 August 2019, 09:27:45 »

Well new cap went on this morning, level appears good after the run to work but it would tend to drop after cooling down. Will check at lunch, but this time I'm not getting that whiff of sweet coolant smell when I checked after stopping.
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Re: Starting with a miss-fire, when left overnight
« Reply #41 on: Yesterday at 09:58:24 »

So on the miss-fire did a little test this morning, I switched on the ignition 3 times. Each time I left it for ~5 seconds on 'full' dash light stage and did not crank engine. Switch off ignition and repeat.

When I did crank and start it, all fine no issues.

 :-\
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TheBoy

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Re: Starting with a miss-fire, when left overnight
« Reply #42 on: Yesterday at 18:07:46 »

Misfire - jump in it tomorrow. Flow throttle to full kickdown, and crank - it shouldn't start. Crank for a good 5s, and repeat. Then start normally. Improvement? If so, replace injector.

Just did this, it fired up with throttle floored.  :-\

Same problem, miss fire which then cleared.
Either it wasn't floored fully, or you've got leaky injector - the latter could cause misfires on startup
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Re: Starting with a miss-fire, when left overnight
« Reply #43 on: Yesterday at 18:26:54 »

Was fully floored. Priming it once or twice appears to make it start without issue
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Re: Starting with a miss-fire, when left overnight
« Reply #44 on: Yesterday at 18:33:03 »

Was fully floored. Priming it once or twice appears to make it start without issue
No mats in the way?

Fully floored, most injection cars should not fire the injectors during cranking. This is a feature to clear a flooded engine.

So if it is starting when fully floored, either its not fully floored, or there is already fuel in the cylinders.


Hope that makes sense :)
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