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Vltrb25 Wont Start

luvpsi

By luvpsi,
in Engines & Forced Induction

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luvpsi Mentor

luvpsi

Posted
Posted

hey guys my tuner rang me today he was about to put my car on the dyno (VLTRB25) it has just had a microtech lt12s installed. he said car had been starting and running just not tuned however now it just wont start. he has now gone onto holidays for 9 days so i have to wait another 9 days. what do you think the problem is. there is power to the ecu and it cranks over just wont start. what are your thoughts it has fuel and spark could it be the CAS. the CAS was removed for wiring reasons and i have heard that the CAS does not like to be touched and often crap themselves once touched

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bubba Grand Master

bubba

Posted
Posted

When you say it doesn't "start", does it just crank and crank and crank with no coughing or spluttering. If the cam timing was out, it should still cough and splutter a bit.

If the CAS is completely dead, then you wouldn't be getting any fuel or spark at all.

bubba Grand Master

bubba

Posted
Posted (edited)

yeah nah no coughing or anything just crank and crank and crank. he just said it has no spark so im assuming it would be cas

Sounds like a good place to start, especially if it has no fuel either :)

What series RB25 is it?

Is there an issue with Microtechs and the standard CAS wheel? I have heard of some ECU's having issues and need to use a specific wheel..

Edited by bubba
  • 3 months later...
Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

How'd you go with this issue?

Sounds exactly like my car. Car was running pretty well, but missed a bit under boost. Got a little worse then the other day while sitting idling for about 5 minutes it started running very rough and would lose it's shit as soon as it started boosting (around 3k RPM). Now it refuses to start. It coughed a few times, even idled very rough for a bit but now nothing. Just crank, crank, crank, no cough, nothing.

I've been trying to hunt down a vacuum leak but haven't been able to find anything.

Where to next?

Car is S2 RB25 (Stagea) with Power FC and Eboost2 running 11PSI. Apparently the car was runnign perfect but started running a little rough after the intercooler was changed and exhaust bolted up. I cannot find any leaks int he intercooler hoses.

Any ideas?

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

Check and replace the spark plugs. Check for spark, check for fuel by cranking over before pulling sparkplugs out to see if there covered with fuel.

When it was running bad it was very, very fuely. It used about 1/8th of a tank of fuel going from Hurstbridge to Diamond creek and back which is about 6ks each way. Was pumping out fuel smoke at idle.

boostn0199 Grand Master

boostn0199

Posted
Posted

I would be looking at the usuals after youve checked spark and fuel look at the CAS and afm. CAS are the worst cause sometimes they play up but arent fully dead so they go on and off or just work but operate completely wrong, Ive gone through 3 this year and each time symptoms were different so check it out.

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