Jump to content
SAU Community

Recommended Posts

so everythings hooked up

I have

Spark'

Fuel

Air

compression 140-150 (cold comp test) across all 6

but the car wont start it cranks over and pops out the pod but doesnt run

I have brand new coil packs and spark plugs

20L of brand new 95 fuel with octane booster so 105ron

only thing I can think of is the advanced timing on the cas is out any ideas

engine is a rb25det neo in an r32 with lots of bolt ons

Link to comment
https://www.sau.com.au/forums/topic/374271-car-pops-but-wont-start/
Share on other sites

should be able to run without the CAS plugged in, should just show engine light, but your bolt on's might be the problem. have you checked everything is in 100% working order? when i did a conversion i found out that my injectors werent getting enough juice so was starving on fuel, still got bit of fuel, but not enough to run.

coilpacks get enough voltage??? or even putting out enough for a big enough spark?

Weird ive always been told you have to have the cas plugged in to start

my injectors are the stock neo injectors in a greedy plenum with a top feed fuel rail and then a tomei fpr the spark plugs are covered in fuel when I take them out so don't think thats the issue but could be wrong

I have brand new plugs gapped at 0.8mm with dsr coils and have pulled each one out and checked the spark it seems fine to me

maybe my injectors arent mounted properly I had issue when fitting them will look again

Unless the engine is seriously modified, it shouldn't need a 0.8 spark gap. Try opening the gap out a bit, maybe 1mm.

If the plugs are coming out "wet", then it is obvious fuel is getting into the cylinders. Make sure you dry them off before re-fitting them.

Try starting with a bit of throttle - let some air in to match the apparent additional fuel. Also, try starting while slowly adjusting the CAS (if you suspect the CAS might be mis-adjusted).

Have you checked the fuel pressure that the fpr is delivering?

  • 4 weeks later...

I'm having a similar problem on my series 1 rb25 in my r32. Everything is good such as fuel, spark and compression and timing. But all It does is back fire when I try and start it. A mechanic suggested the battery might not be good enough. I trickle charged it for 24 hours but still no go. The battery is about 5 years old though and has been relocated to the boot

Is say its coil pack related. Have u teasted spark?? Checked the fuel is flowing? Theres a trick with twisting the cas whilst ignition is on to hear ur inj firing. I had fuel lines wrong way round once, obviously didnt fire

yep i have spark on all 6, and good compression on all 6. got a new battery cos the one i had wasnt the best. It sounds a lot better and closer to starting now, but its just not getting there. all injectors are working and tested and i have my fuel lines around the right way.

starting to get frustrated :(

Spoke to my mechanic poping out the pod filter is timing out and poping out the exhaughst is tuning eg unburnt petrol hitting the hot exhaughst he had an mr2 with the problem and actually showed me it was actually intresting

well i got my car to start just now. I turned the CAS pin 90 degrees cranked and she fired right up. Now onto the next problem. when i start it it just revs up hard with out my pushing the pedal at all. I loosened the throttle cable so its loose but it still keeps doing it. Any ideas?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Had a go at the stuck crush tube this afternoon. Tried things like grips and a chain wrench first but wouldn't just twist straight off. So got to work with a drill. Started small and kept a depth stop on to make sure I didn't drill into the bolt. Made a line of drill holes all the way up and enlarged them. Then a combination of chisel and Dremel to split it all the way up. Levered the split to get oil in there and eventually it gave a bit while levering. Worked it back and forth with loads more oil till it was spinning freely, then with grips I could work it downwards and off. And no significant damage to the bolt (not by me anyway - just the 27 years of rust)
    • Well, I'm tired. I'm tired because about 4PM yesterday, before today's appointment someone immediately bought my bumper. They couldn't get it any other day as they're on the way back to NSW. So I had to do that big GTR conversion I had been planning. Unfortunately, the information on SAU about what you need and how this is done is incomplete. So what should be a simple bolt on affair, yeah, it's not. Did you know if you use all GTR items the bonnet won't close? This little manuever sent me into about 1am the night before trying to dodge a way to get it closed. I will have to revisit this in the next few days  - or maybe not, I may let a body shop figure it out. It all needs to come up and my motivation to pull the bumper off is low. It also seems to hit things in the bay where the GTT bonnet didn't. Yes I used 100% new OEM GTR items. Today, I had the joy of driving to the dyno looking like this: Given I had roughed in the fuel and given sensible but pretty conservative timing, I didn't really bet on having the car drive out any real difference than when it drove in. Sadly due to a miscommunication and laptop fun and games (and almost bricking the dongle, prayers and firmware updates indeed), I ended up using HP Tuner credits to licence the car that was already licenced. So in the end my laptop was used. It turns out my butt dyno is still well calibrated after all this time. The 325kw was on 74% Ethanol, the 313kw line was on 98. The other line is the 'before' line which was 281kw. While the numbers are pretty low, they're pretty in line with what you'd expect. Even if US dynos bump the whole result up about 50KW, gaining 10-15% is similar gains.  The curve of the cam is pretty much spot on with what was discussed as well. All this said, it still feels bad to not see the number you secretly want to see. Even if the car drove great beforehand, and I knew pretty confidently the car would drive out much the same way it drove in due to the nature of a wellish dialled in LS1 not gaining much if anything at all from being tuned from where it was. As expected, the car isn't particularly sensitive to running it at anywhere between 12.0 and 13.0 - And the initial timing at 20deg and 12.0 made 308KW. So 3 degrees of timing, and leaning it out to 12.7 for 5kw, anything above stopped giving any benefit until E85 (which has an additional 2 deg as before). Car itself behaved entirely fine. I found out that 100C = 1.15V! IAT at about 7pm was 19C. I might mess with the bonnet mounting.. but given the REO NEEDS TO BE CHOPPED TO FIT A GTR BAR this is possibly something I may leave gathering (more) dust until it returns to paint jail.
    • It sounds farrrrrrr too cold at your place Duncan... Here I was thinking our 10 degrees overnight is getting cold...
    • oh yeah, reminded this morning....bin lids frozen shut too
    • In my case not, because of total reno. But yeah.
×
×
  • Create New...