2007 rx8 turning over but won’t fire

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Cconnor95
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2007 rx8 turning over but won’t fire

Post by Cconnor95 »

Hi all
My rx8 has been negated over the past few weeks it’s been sat on the drive and not been started up or driven.
I charged the battery as it was flat but now it turns over but won’t start. Any ideas what it could be it were to start looking?
Thankyou
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warpc0il
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Re: 2007 rx8 turning over but won’t fire

Post by warpc0il »

It could be flooded after being switched off cold the previous time it was started, or from being turned over on the starter without enough voltage to trigger the coils.

Now you have to work from basics:
- fuel
- air
- sparks
- compression

Does the CEL go out while the engine is turning on the starter?

If not then the PCM may have detected a fault, such as Eccentric Shaft Sensor voltage, in which case it won't trigger the coils or run the fuel pump.

Get an ODB reader connected and see if there's any codes, also read engine revs and voltage while turning on the starter.

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Cconnor95
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Re: 2007 rx8 turning over but won’t fire

Post by Cconnor95 »

Hi
Thankyou for the reply I have got no codes stored
and it’s getting a spark.
It’s getting fuel so I would assume crack position sensor?
I should know this with being a mechanic😂 but I’m stumped
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nightfire10
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Re: 2007 rx8 turning over but won’t fire

Post by nightfire10 »

Try a tow start in case it's flooded
Hayward's Street/bridgeported rebuild,595's,Tein coilovers edfc Racingbeat rear anti roll bar oil pres oil temp gauge pod's,lockwood front rear grills,Tinted wind ws folding tow hook's,595s,connect2 ,at long last sohn and ap50 tank instaled ,revi ram air duct already fitted ! calipers painted,diff oil changed .
just oil lines to fit at some stage ( had them a while too) :P

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Re: 2007 rx8 turning over but won’t fire

Post by Shagrington »

I'd be inclined to try a tow start as the easiest way to clear it if it is flooded ... but I am definitely not a mechanic, so take better informed advice first.
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Cconnor95
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Re: 2007 rx8 turning over but won’t fire

Post by Cconnor95 »

Wouldn’t I still be getting a spark at the coil even if it’s flooded?
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warpc0il
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Re: 2007 rx8 turning over but won’t fire

Post by warpc0il »

Cconnor95 wrote:
Mon Mar 09, 2020 6:42 pm
Hi
Thankyou for the reply I have got no codes stored
and it’s getting a spark.
It’s getting fuel so I would assume crack position sensor?
I should know this with being a mechanic😂 but I’m stumped
:?
Dave
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nightfire10
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Re: 2007 rx8 turning over but won’t fire

Post by nightfire10 »

Cconnor95 wrote:
Mon Mar 09, 2020 7:41 pm
Wouldn’t I still be getting a spark at the coil even if it’s flooded?
If it's flooded even with a spark it ain't starting tow it!
Watch out for you crack 😉
Hayward's Street/bridgeported rebuild,595's,Tein coilovers edfc Racingbeat rear anti roll bar oil pres oil temp gauge pod's,lockwood front rear grills,Tinted wind ws folding tow hook's,595s,connect2 ,at long last sohn and ap50 tank instaled ,revi ram air duct already fitted ! calipers painted,diff oil changed .
just oil lines to fit at some stage ( had them a while too) :P

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Cconnor95
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Re: 2007 rx8 turning over but won’t fire

Post by Cconnor95 »

Hi all
Thankyou for the advice but I made a mistake in the post meant to put that I’m not getting a spark but I am getting fuel
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warpc0il
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Re: 2007 rx8 turning over but won’t fire

Post by warpc0il »

The PCM should trigger the fuel injectors without into from the ESS, so that's unlikely to be the issue.
It does sound like you've got (one or more) ignition issues.

It's possible for the engine to run with both trailing plugs not firing, due to coils, or plugs, and an inexperienced owner might not notice.
Lose the lead plugs and then it won't run.

Start by removing and inspecting the plugs themselves, note the leading and trailing are different.
The condition of the plug tips tell you a lot.

Actually, there's another quick check you can make, as you have quality aftermarket HT leads...
These caps have tough weatherproof caps on the plug ends that can grip quite firmly to the plug insulators before they are fully locked onto the metal contacts.
If they weren't pushed fully home when fitted then they can work their way off sufficiently that there's no longer an electrical connection.
Try removing the caps from the plugs, spraying with some silicon oil, or a wipe with dab of silicon grease, then push firmly back on - there should be a "click" as the connector locks.
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