Jump to content
SAU Community

Car Pops But Wont Start


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
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?

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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?

Link to comment
Share on other sites

  • 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

Link to comment
Share on other sites

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 :(

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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?

Link to comment
Share on other sites

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
 Share



  • Similar Content

  • Latest Posts

    • A euro that old, I'd change the bearings anyway. But definitely lift the wheel and give it a wobble.
    • You're onto something here... Maybe that's his plan all along, he's just pretending to leave it stock then nek minnit, LS Bogan MX5
    • He could just take the Bogan Cruise Ships setup... Already got a good setup, with blower, the auto was rebuilt too wasn't it? Perfect time for him to upgrade the tailshaft, diff, and axles...    And wouldn't need to waste money on redoing the Commos seats, as he could just buy race seats for the 5...   As a highly modded car he could avoid the ability to give it away to offspring too when they crash their cars...
    • It's really interesting how much it's moving left to right, and doesn't appear to be actually spreading. For this to be moving left to right, without flaring, means unequal forces being applied until equilibrium hits in one way or another.   Reasons it could be unequal; Piston sizes left to right are different sizes. Only minute differences. Pistons moving on different planes. That is, are they moving directly straight at each other, or slightly out of alignment. The fluid is restricted getting to one side.   Some tests you could do. Pull the bleeders on the left and right, fit each side with pressure gauges. It will allow you to make sure pressure is equal (and really, it should be as fluid flow is so damn low, so fluid flow dynamics shouldn't come into it).   With the calipers off the car, have both sides retracted as far as possible, measure very very accurately (think micrometre) distances between opposing pistons in four different spots per set of pistons. Firstly, on each opposing pistons pair, the measures on for different spots should be equal. If it's not, and especially if one spot appears to actually get closer compared to another, the pistons aren't aligned, and now the forces left to right won't be equal, as they're the forces fighting each other.   You can also pull all the pistons out, and very very accurately measure the diameter of them. If they're not equal left to ight in the pairings, and especially if the area of the pistons on one side is different to the area on the other overall, it'll all be out of whack.   My bet, is shit QC in making sure the pistons move in the same plane left vs right. Some minor out of square machining, and nothing will line up, things will want to move around.  
    • Whilst putting a V8 in a MX5 would be fun, it would negate the whole cheap to run fun daily that the MX5 will be used for If I wanted a faster little convertible I would have got a engine check light, I mean a BMW Z4 M, but going off the issues that the guy at work who recently got one is having, it is lucky I didn't  Meh, horses for courses, the Bogan Cruise Ship is my go to for some horse torques    
×
×
  • Create New...