Jump to content
SAU Community
  • Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


bilaldabab

R33 Gtr Starting Problem... Starts When It Wants.

Recommended Posts

Hi Guys

I've tried reading multiple related threads but i can't seem to find any that entirely relate to my issue.

My GTR randomly starts whenever it wants. It cranks fine but just struggles to start. I find it struggles more when warmer, but occasionally doesn't start when cold also.

I've replaced coilpacks, spark plugs, ignitor.

I've re-grounded all the earthing points.

I've changed the battery

I've played around with the cranking ignition timing on the Power FC hand controller

It's got a forged motor and running a power fc with supporting mods.

Sometimes when I give it gas while cranking it helps and other times it makes no difference.

the thing which i can't figure out is that whenever i connect a jumper pack to the battery, it always starts up. Any ideas what this could be?

Thanks

Link to post
Share on other sites

I think what you really mean is that it doesn't randomly start when it wants. If it did, it would imply that it would start itself even if/when you weren't present.

If what you really mean is that it is just difficult to get it to start and that it sometimes does and sometimes doesn't, then there would have to be thousands of threads on here all about that. Coolant temp sensor is a prime candiate here. As is AFM dirty and/or cracked solder joints. And dirty injectors, weak fuel pump, and about a bazziliion other things that have been posted about.

Link to post
Share on other sites

I assumed people would understand what I meant when I said randomly starting...

And like I said I've read many threads but none of them seem to entirely relate to my issue. From what I have read, I have tried to fix/replace.

I've also tried cleaning the AFMS, and have also opened them up and resoldered the joints. It's got a fairly new fuel pump which primes fine.

My question is.. why would it start fine when I put a jumper pack on? but without it, it struggles or doesn't turn on?

I'll try checking the coolant temp sensor and cleaning the injectors this weekend.

  • Like 1
Link to post
Share on other sites

So it is happy when you connect a jumper onto it?

Do you connect the jumper leads onto the terminals or one onto the chassis?

Could it be corrosion in the cable going into the earth terminal on the battery?

And there's no reason why the battery you put in couldn't be rooted.

Edited by Ben C34
Link to post
Share on other sites

So it is happy when you connect a jumper onto it?

Do you connect the jumper leads onto the terminals or one onto the chassis?

Could it be corrosion in the cable going into the earth terminal on the battery?

And there's no reason why the battery you put in couldn't be rooted.

Yes it always starts up when i connect a jumper pack to the battery terminals in the boot.

The battery I put in was new so there shouldn't be any reason for it to be rooted.

Link to post
Share on other sites

Shouldn't be a reason. But seems like it is.

If it was me I would try a a different battery.

And ensure battery terminals are clean.

Edited by Ben C34
Link to post
Share on other sites

The starter could be an issue. It might be 'poling' I think we used to call it where the starter directly connects + and - internally and draws huge current, enough to drop voltage under 12V which takes out some of the systems required to start the engine (injectors, coils, computer etc can cease to operate under 12v's).

Do a voltage current draw test to see how much current draw there is when cranking. If it's super high I would first check the main terminal to the starter. If that's fine I would then presume you have an internal issue in the starter.

Or, it might have not one fu(king thing to do with the starter.....

Link to post
Share on other sites

Does it always start easier with the water temperature sensor disconnected? (the one to the ECU not the dash)

Could be your cranking tables are too lean OR injectors are clogged and spraying less fuel than before with low pulse widths.

Link to post
Share on other sites

So battery voltage sits around 11-12 when car is off. As soon as I start cranking it drops to 8-9. When I put the jumper pack on and crank it drops to 10-11 and turns on.

Link to post
Share on other sites

Have you tried charging the battery?

Sounds like the battery has dropped a cell, as in the plates are touching or something. If it's new take it back and get it checked, it may be under warranty.

Link to post
Share on other sites

So battery voltage sits around 11-12 when car is off. As soon as I start cranking it drops to 8-9. When I put the jumper pack on and crank it drops to 10-11 and turns on.

Fully charged voltage on a lead acid battery is AT LEAST 12.7v. Should sit quite happily at 12.9v switched off. 11-12v with nothing running indicates a f**ked battery.

  • Like 1
Link to post
Share on other sites

The starter could be an issue. It might be 'poling' I think we used to call it where the starter directly connects + and - internally and draws huge current, enough to drop voltage under 12V which takes out some of the systems required to start the engine (injectors, coils, computer etc can cease to operate under 12v's).

Do a voltage current draw test to see how much current draw there is when cranking. If it's super high I would first check the main terminal to the starter. If that's fine I would then presume you have an internal issue in the starter.

Or, it might have not one fu(king thing to do with the starter.....

I'm going for this one. Had a similar problem with my 32, and it only got worse, to the point that even a jump start wasn't always enough to start properly.

Replaced the starter motor and don't have starting problems any more.

Link to post
Share on other sites

I'm going for this one. Had a similar problem with my 32, and it only got worse, to the point that even a jump start wasn't always enough to start properly.

Replaced the starter motor and don't have starting problems any more.

Even based on his flat battery volt test?

Link to post
Share on other sites

I ended up taking the battery back and they replaced it with one double the size. It still cranks for a while but has turned on every time so far. I guess if I get the same problem again, I'll try a new starter motor.

Link to post
Share on other sites

so in other words the old battery was shit and had dropped a cell, like stated before 11-12 volts means its probably dropped a cell..

A good battery will have an output of around 2.2 volts per cell, so 13.6 in total.

You must remember RB's are very sensitive and will play silly f**ks with you if you don't have enough voltage

Link to post
Share on other sites

Is your fuel pump priming? I just changed mine as starts were slow and then finally just cranked but wouldn't turn over. Maybe low voltage to the fuel pump relay?

Link to post
Share on other sites

I'm 'not sure if this is a similar issue but sometimes when i turn the key it starts right away, and sometimes it struggles and i need to give it abit of gas to get it to start.Thought it was the battery but replaced it and still same issue, is it the starter motor? Any advice?

Thanks

Link to post
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



×
×
  • Create New...