Hesitation!

[DMDRIFTING]

Trust me to search the site and find \'IIRC on the intake system\' ahhahahahahahahah
 
:rollin

[DMDRIFTING]

What does the PD look like?
 
Also just looking into the \'Double throttle\' and how many people have disabled it or removed it as this could cause boost/hesitaion problems!
 
Worth looking into?

[DMDRIFTING]

Had a little look into the Fuel Pulsation Damper looks very similar to a FPR, quite expensive to replace!

Will check this as soon as possible

[DMDRIFTING]

Ok new leads are on..

Problem is now apparent immediately while on WOT under load???
All fine on WOT off load?? Which is leading me to maybe over boosting?



Also checked Pulsation Damper and all seems fine, no sign of cracks or leaks!


Will be sticking on the defi boost gauge and see what its running at!

Anyone have a boost controller for sale?

[DMDRIFTING]

Just looking into other threads with similar problems, and the battery and voltage to fuel pump has been mentioned!

My car still has the original battery from Japan, could be worth replacing?

[DMDRIFTING]

Right.........

Woke up this morning went to start the RX7 and no fuel getting to the injectors, cannot hear fuel pump priming but the fuel pump fuse is fine?


Guess its a brake in the Live wire? Had a similar thing happen on the Subaru a couple of years ago! Rac routed a new live so gonna get a lift to work and sort when i get home!


Any other ideas?

[Aceman]

Sounds similar to something I had, and after some investigation, we simply replaced wiring to the fuel pump, and then a secondary live feed to the ignition amp, and all was solved...

[DMDRIFTING]

Hi Aceman,

could you explain how you ran a secondary live to the ignition amp, Tim @ Rxmotors has advised on this, and want to get it right if i do it!

Have power/voltage running to connection above fuel pump,  will need a new fuel pump unless one of the wires on the actual pump has worked its way lose?

Thank you

[Aceman]

If I understood it, I\'d let you know..

Haywood rotary fitted it! I think it\'s simply a wire from the battery to the ignition amp (somewhere on the circuit board box thing on passenger side by the ABS) with a relay in it running from the ignition (to cut the live feed when the car is off)..

Make sense?

Can\'t take photos for you sorry as car is in the garage for a rebuild.....  

[DMDRIFTING]

I don\'t like electrics.

So its just one extra live wire connected to the battery live, onto the Ignition Amp live, with a  relay in between it?

[DMDRIFTING]

Any more info on the secondary live?


Ordered new fuel pump as this gave up the goat yesterday, uprated of course! Will fit when it arrives and report how the car is!

Could have been the whole problem all along, as the fuel pump would be working harder once warmed up, and could have been breaking down for months!!!

It is the standard original pump so fingers crossed my problem is sorted after this?? :Grrr

[DMDRIFTING]

Going to put a BNR33 uprated pump in on the weekend, just until my new one arrives!

[DMDRIFTING]

New Sard 280ltr fuel pump fitted and the car started fine, took it out for a drive and all ok.

Woke up this morning to take the car out in this lovely sunshine and again not starting - lack of fuel and pump not priming.

Checked all relevant lives - 11.9v to fuel relay, 11.9 to fuel pump fuse, but nothing running to top of fuel pump.

Indicates a break in the line which didn\'t show up with the RAC - 11.9v when they checked to the top of the fuel pump - argh

New live run from fuel pump fuse which had shown 11.9v, checked again and it dropped to 8v then checked the live from the positive on actual pump and it was reading 11.9v? Is this normal?

Put it back together and took it for a little run, had fuel cut on \'wot\'!
Reset the ecu and took it out again and all is fine will confirm if hesitation returns but fingers crossed this is it.


Oh and now have a small coolant leak from the bottom of the pipe that runs through the plenum argh, if i could afford a newer RX7 i would buy one right now lol

[DMDRIFTING]

I\'m going to run a new live from the ignition barrel to the ignition amplifier will this be ok?

Could i run a secondary live from the fuel pump fuse line?

Can the secondary live be taken from any other live or will it affect/drain the voltage if you have two particular units running off the same live?

Many thanks

[DMDRIFTING]

Running two post\'s effectively on this hesitation problem!

Attached a new live to the fuel pump but still not got round to attaching a secondary live to Ignition Amplifier!


But to let you know i have taken the FD3S on a long spirited drive as you would on track and guess what?


NO HESITATION WHAT SO EVER WAHOOOOOOOOOO!


Many thanks to all and hope this may help someone else in the future?