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RB26 not warm starting - issue resolved

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By Links,
in Car Audio & Electrical

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Posted
Posted

Afternoon all,

Posting for others in case they run into the same issue.

Problem: R33 GTR running Nistune ECU - cold start was not a problem, once warmed car would struggle to start again if you turned it off. Sometimes with throttle. 

Symptoms: Cold start was fine. Warm start once at temp was not. We let it cool down + had a battery booster pack (was low due to trying to start) and it started.

Actions taken:

  • Replaced CAS as had a rough idle when at lights + started once it was cooled down. Adjusted base timing (removing TPS). Did not resolve the issue. 
  • Looked at Nistune and saw that battery voltage was dropping to 7- 8.5v when trying to warm start.
  • Replaced with Supercharge Gold Plus MF55B24L battery ($160 from Autobarn wih 40 month warranty) which has a CCA of 490 - you just have to unbolt the rear strut and move it out of the way. Note that the battery is too tall, so factory brace won't reach.
  • Post battery replacement - minimum voltage seen when cranking > 10v and no issues seen starting.
  • I also found that during testing using Nistune my O2 sensors are not responding (they are dead) showing 0v - will replace them.

Summary: insufficient battery voltage to crank when warm.

Hope that helps someone in future to check if they are having a similar issue.

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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Did you try adding more fuel to the cranking table when warm?

With Nistune you're unable to set injector dwell vs voltage. It's just a fixed dwell so when you're cranking you might be under injecting fuel when your battery voltage drops.

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