Just finished building a 3dr drift project , it's yb powered and not running cleanly.

I don't seem to have a great spark at number four as if I unplug four spark plug I don't get a note change and the disb cap earths /sparks to the inlet manifold,
All other cylinders drop note when unplugged but also hear a clicking sound from dist cap ??

I unplugged the dist multiplug and when I plug it back in the std fuel press reg opens/activates (strange one)on the fuel rail

I changed to a new cap and just swapped over five leads and cap from my running cosworth to double check ??? SAME

Help........

 

Have you tried different plugs?

 

Swapped plugs to no avai but the switching of the fuel pressure reg when disconnecting the dist plug has me thinking it more complicated than that....

 

surely it's 2 separate issues
the lack of spark/poor running at 4 can only come from the dizzy cap to the plug or a lack of compression /cylinder issue at no 4 as your fpr issue would effect all cylinders

I'm not sure about the FPR issue

steve

 

compression test?? is plug 4 wet with fuel??

 

Youth

Changed cap,leads from my running saff and no difference, fuel pressure set at 2.5/3.0

Must just check for four teeth on front pulley and then distrib ???


Comp checked at 120 on all four (good/bad???)

 

Have you tried swapping injectors round to see if the misfire moves?

 

Im not sure exactly what you mean with the fpr 'issue'
the fpr opens when the fuel inside the rail reaches a certain pressure. If its clicking are you sure you arent turning the pump on and off when you are messing with the wiring?

 

If I have eng off,ign on and I disconnect the dist multiplug the fpr opens/clicks , strange one !!

Doesn't happen on my saff

 

Fraser

A buddy did that already when trying to help diagnose fault

 

possible rotor arm inside the dizzy? i know you changed the cap and no change but id still change the rotor arm to rule it out

 

Cheers, will try that,another thing to eliminate

 

Distributor?

 

New phase sensor fitted, what else gets wrong in there??

 

Still haven't got someone to verify this is wrong /suspect


Originally Posted by fraser9764
Im not sure exactly what you mean with the fpr 'issue'
the fpr opens when the fuel inside the rail reaches a certain pressure. If its clicking are you sure you arent turning the pump on and off when you are messing with the wiring?


If I have eng off,ign on and I disconnect the dist multiplug the fpr opens/clicks , strange one !!

Doesn't happen on my saff

 

The worm gear could be fine but there could be movement in the distributor shaft then the air gap between the rotor arm and point4 on the cap could be increased?

 

Think I saw a new dist for sale on one of the forums ...

 

Check for movement first, also get someone to turn the engine over with cap off and see if if the shaft is spinning dead centre and not bent in any way

 

Will check am...

 

your fuel pressure should be 3 bar with vac pipe on and 3.5 with vac pipe off
mark

 

Your right , that's what I set it to recently ,

Cheers

 

Is pulling that plug on/off just stopping/starting the fuel pump running?

 

Haven't heard pump start from up under bonnet area but the fuel reg clicks and pulses so let's fuel through back to tank ???

 

Just thinking the rail will always be at full pressure while igns on afaik as pressure will be maintained by pump to set pressure

Any chance dist plug is swapped with another , for example the iscv....
They won't reach but had loom checked and he wrapped in new oem tape and maybe same length leads and they got mixed up...

 

Just went out to check lugs on crankshaft wheel and all four in place but FFS , to answer a question above I thought I'd check if disconnecting the dist multiplug would fire the fuel pump , and yes it does......but I wiggled the loom and found if I disconnect or wiggle the crankshaft sensor I also fire the fuel pump which results in the clicking I mentioned earlier on the fpr (valve opening releasing pressure back to tank),,,,,,,

Bloody Nora

 

120 across all four

Will pull plugs again but didn't notice last time ??

 

Poor earth from ecu?

 

Worth a look ginge

 

Clearly the problem lies with a mechanical problem on that cylinder!

Compression does not really tell you much as there may be a bad valve clearance, for example.

The FPR is a totally mechanical affair, it's more likely what you are hearing is the injectors 'pulsing' with you plug the PHASE sensor back in.

When the ignition is on the fuel pump does not run (unless you have changed the standard setup)

Martin

 

Next job, look into this, you have a problem with the insulation somewhere, this shouldnt happen. Inspect the ht lead and boot on the end carefully, and check there are no cracks in the cap.

 

Fraser, cheers for the help

More jobs fir next day off

 

You have changed cap and leads already...

Martin

 

Are you getting power and a earth to no 4 injector.You could of damaged/moved a pin on the engine ecu.

 

Regardless, there is no way the distributor/leads should be arcing to the cylinder head, something is wrong there.

 

Yes , swapped from running car

 

Glenn
Presume I just ping the inj multiple plug while cars running to check volts...

 

So what exactly does the dist multiplug do , send power to dist or return a signal from dist ???

 

It's bin a while since I've seen one but if its a 3 pin, 1 will be ign live, 1 will be earth and the other is a pulse from the distributor

 

you cannot see the pulses to the injectors with a meter you need a void light

phase sensor sends a signal back to tell the ecu which pulse from the crank pulley is tdc and 90 degrees btdc (sort of reminding it where the engine is for ign timing)

make sure you have a 0.6-1mm gap on the crank pick up sensor


David

 

This is incorrect, the phase sensor is to inform the ECU the 'phasing' of the cylinders, for sequential fueling.

Martin