Author Topic: Help Rx7 FD Wont Start - Have fuel pressure & spark  (Read 1792 times)

Offline ttpower

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Help Rx7 FD Wont Start - Have fuel pressure & spark
« on: March 01, 2016, 06:43:59 PM »
The car started fine, ran out of fuel outside the house(was stood for a while) then after lots of attempts to start, burned the starter motor.
So changed for a new starter motor, she started up straight away and would only idle, any gas and would cut out.

Now she not starting at all. At first it tried to start, now it just doesn't even attempt too.

I've done the following;

1) Cleaned plugs. They kept getting soaking wet of fuel after cranking so changed injectors to standard rails (were aftermarket before). Now seem to be normal with little fuel but still no attempt to start.
2) Checked injector wiring (lightbulb test) and operating ok.
3) Fuel pressure when cranking is 42psi
4) Have spark.
5) No fuel leaks.
6) cant see any boost leaks (very few vacuum lines as single turbo)
7)Not done compression check, but when plugs out have even, loud swoosh noises.

When cranking PFC shows 8 & 0 degrees for IGN.

I've also noticed that when cranking over,in the PFC Sensor screen the PIM, VTA 1, VTA2 highlight and voltage shows 0.00V. This is only when cranking, when the key is just in the on position they are not highlighted and show correct voltage. Is this normal?

Anyone have any ides what to try next?



Offline clive

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #1 on: March 01, 2016, 07:34:50 PM »
Unfortunately from your No1 I would say it is still flooded,  :-[

In the past I have towed cars for 1/4 of a mile that have been flooded like this before they chug into life.   
All the best Clive

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #2 on: March 01, 2016, 07:35:08 PM »
Thats is strange...sorry to state the obvious but have you done a full deflood....fuel pump relay out and sparks out and crank til no fuel mist....?
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #3 on: March 01, 2016, 07:36:01 PM »
Lol 2nd time this week Clive posted a second b4 me!
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline ttpower

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #4 on: March 01, 2016, 07:40:12 PM »
Thanks for the advice guys. Yeah done the full de-flood........plugs out, loas of mist until cleared. Plugs were soaking wet with fuel, cleaned and dried them, put them in..............still nothing, not even an attempt to start.

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #5 on: March 01, 2016, 07:48:58 PM »
As Clive said try a towstart?
Ive blowtorched sparkplugs to dry them out in past.
 
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline ttpower

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #6 on: March 01, 2016, 07:52:55 PM »
Would be hard to tow as quite low  ::)
How about easy-start spray? When you say blow torch, u mean to heat them up....would new plugs be best bet?

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #7 on: March 01, 2016, 08:01:06 PM »
Yes new best but if dont catch and foul them up ive removed and warmed them up.
The replacement starter new or used just wondering what its cranking speed is?. Does seem strange that fired and idled and died on throttle....
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #8 on: March 01, 2016, 08:02:59 PM »
My mate used easystart on his ran til he ran out of easy start...he had problem with the syphon in his tank in his rx8. Got it running but not something ive done.
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline clive

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #9 on: March 01, 2016, 08:42:14 PM »
Lol 2nd time this week Clive posted a second b4 me!

I like a good close race  ;)
All the best Clive

Offline ttpower

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #10 on: March 02, 2016, 09:55:35 AM »
Ok, ordered some new plugs today to try out and give a go with some easy start see if it does the trick. Its cranking at 200rpm with the new starter.

Can someone confirm if there PFC sensors "PIM, VTA1, VTA2" highlight when there cranking over?

Seems bit strange that these drop to 0.0v when cranking.

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #11 on: March 02, 2016, 11:35:20 PM »
Take the plugs out and main fuse out.  Turn over until mist clears. Leave plugs out overnight.  With main fuse out turn the car over the next day to clear any settled fuel.  Put in new plugs and put fuse back in and fire it over.  The plugs are probably knackered now so definitely change them.  Also connect up a second battery via jump leads to give you some extra oomf  when turning over...worst case add a couple of drops of atf into the plug holes and turn over then put in plugs and try and start.  That will help build a bit more compression.  Dont rev it and let it idle. it will smoke alot...hth
Definately want it mate but the dog has just died so will be getting the missus a new dog for christmas....
Sounds like a good deal but will have to ask the dragon first.....  :flamed  :spank

Offline ttpower

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #12 on: March 03, 2016, 08:54:02 PM »
ok, so put new plugs in and new leads....same thing not starting or even catching. Tried with some easy start and she started firing but still no start.

Anyway, I plugged out the electrical plugs to all the injectors and only connected up the secondaries using the primary connectors. She fired right up, and started to hunt. Traced a loud hissing leak to the secondary injectors where the injector goes into the manifold, so ordered some new seals. For reference the part number for these are NF01-13-257A (Lower Secondary Fuel Injector Grommet). They should be here in a few days so hopefully will resolve the issue.

Just a quick question, would this vac leak actually prevent the car from starting?


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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #13 on: March 04, 2016, 06:58:12 AM »
When you ran out of fuel it was idling on the primarys sounds like 1 or more injector air locked or youve got an primary injector down? But when you lightbulb tested injectors sounds like 1 plug not seated afterwards?
Should prime easy in couple of cranks...so i think it was flooded and possibly a bad connection on a primary injector after removing? All speculation though.
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline ttpower

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Re: Help Rx7 FD Wont Start - Have fuel pressure & spark
« Reply #14 on: March 04, 2016, 11:42:28 AM »
Yeah it was idling fine then soon as any gas it cut out.
Both primary injector electrical plugs were showing to run fine and now with them in the secondaries the car is starting and idling but just hunting. When I got it started this time it only started to hunt when she got warm so was able to trace the leak. I'll try these new seals when I get them and if still having issues will take out the primaries and get them cleaned.