Jump to content
SAU Community

Car Issues....losing power (Still) Help!

Rob

By Rob,
in South Australia

 Share

Recommended Posts

Rob Collaborator

Rob

Posted
Posted

Howdy All,

Unsure if you remember but a while back I was having power loss probs with my car, here is the scenario:

- Car will run perfect but suddenly lose power and not go anything over 2000rpm.

- If it does this and I stop the car, turn it off, and turn the car back on again 8/10 times the car will run perfect again.

- Car will go up to 200 - 300km's of travelling sometimes without this problem happening..sometimes more.

- Also does not seem to have anything to do with outside air temp ... it happen on a coldish night and also a hot day.

- Fuel levels don't seem to be an issue, only thing i have noticed it seemed to do near 1/2 full and close to empty ?

Since then I have taken it to 2 places and they can not find a fault with it and it runs perfectly when the check it out and run it on the dyno.

I am basically out of idea's except trying a new ECU & AFM.

Does anyone out there have any other idea's? , any Mechanic's out there that have seen anything like this b4?

BTW the engine is a 1G-GTE Twin Turbo.

Help!! :cheers:.

Rob.

Link to comment
https://www.sau.com.au/forums/topic/29552-car-issueslosing-power-still-help/
Share on other sites
Freebaggin Proficient

Freebaggin

Posted
Posted

With R33s at least, the plastic ECU connector can warp under certain conditions and some of the connections come appart. Mine was having intermittent fuel pump probs due to this (a relay connection) and when we reinforced the connector it has been fine for over a year.

EnricoPalazzo Grand Master

EnricoPalazzo

Posted
Posted

like i said b4 in an older post. I had very similar problem to u. Turned out to b the loom plug into the ecu and the ecu itself.

So i changed both and fixed the afm and it worked. im thinkin the reason no one can find the problem is because it is a connection problem where everytime someone is lookin at it, it is fine.

Freebaggin Proficient

Freebaggin

Posted
Posted

Yeah that's the one Enrico, the loom plug.

Steve, it was very involved and highly technical ;) . We used stuff called Black Insulation Tape (this is very expensive nuclear radiation proof material, only available from the US Defence Dept.!) and stapped it up around the edges. It only became apparent when we did the Microtech plug in.

Rob Collaborator

Rob

Posted
  • Author
Posted

ROFL only Joolz could get a pic of elec tape that quick....classic :D

Cheers thanks for the info guys, gonna have a good look at the loom and see if i can get another ECU to try out in it.

Let's hope for a good outcome!!

On a lighter note my car makes 100 RWKW on stock boost.... feel the power lol!

But hey it also gets about 410km's on 47 Ltrs of Fuel ... I can live with that ;)

@(*_*)@ Collaborator

@(*_*)@

Posted
Posted

Rob, I think I had the same problem as you before, but mine was because of the AFM, I took my car to few different places and no one can find the problem. All they said the problem could be from:

1) the AFM

2) may be there has some bad connection somewhere in the car

3) the connection of the ECU

They tried the connection of the ECU and problem still there, so I went to the other shop and they clean the AFM for me, and things seem to get better. So, I went home and I changed my old AFM back and the problem was gone.

*I found sometimes the AFM has problem, but we just don't know, because they still look clean and good.

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
Go to topic listing


  • Similar Content

  • Latest Posts

    • RP1421
      S15 Spec R

      By RP1421 · Posted

      As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
    • perry_r33
      R34 GTR Vspec Garage Sale - All must go!

      By perry_r33 · Posted

      Pm sent 
    • Robot
      Skyline v36 350GT sedan hunting on idle

      By Robot · Posted

      Hi,  Just joined the forum so I could share my "fix" of this problem. Might be of use to someone. Had the same hunting at idle issue on my V36 with VQ35HR engine after swapping the engine because the original one got overheated.  While changing the engine I made the mistake of cleaning the throttle bodies and tried all the tricks i could find to do a throttle relearn with no luck. Gave in and took it to a shop and they couldn't sort it. Then took it to my local Nissan dealership and they couldn't get it to idle properly. They said I'd need to replace the throttle bodies and the ecu probably costing more than the car is worth. So I had the idea of replacing the carbon I cleaned out with a thin layer of super glue and it's back to normal idle now. Bit rough but saved the car from the wreckers 🤣
    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      After my last update, I went ahead with cleaning and restoring the entire fuel system. This included removing the tank and cleaning it with the Beyond Balistics solution, power washing it multiple times, drying it thoroughly, rinsing with IPA, drying again with heat gun and compressed air. Also, cleaning out the lines, fuel rail, and replacing the fuel pump with an OEM-style one. During the cleaning process, I replaced several hoses - including the breather hose on the fuel tank, which turned out to be the cause of the earlier fuel leak. This is what the old fuel filter looked like: Fuel tank before cleaning: Dirty Fuel Tank.mp4   Fuel tank after cleaning (some staining remains): Clean Fuel Tank.mp4 Both the OEM 270cc and new DeatschWerks 550cc injectors were cleaned professionally by a shop. Before reassembling everything, I tested the fuel flow by running the pump output into a container at the fuel filter location - flow looked good. I then fitted the new fuel filter and reassembled the rest of the system. Fuel Flow Test.mp4 Test 1 - 550cc injectors Ran the new fuel pump with its supplied diagonal strainer (different from OEM’s flat strainer) and my 550cc injectors using the same resized-injector map I had successfully used before. At first, it idled roughly and stalled when I applied throttle. Checked the spark plugs and found that they were fouled with carbon (likely from the earlier overly rich running when the injectors were clogged). After cleaning the plugs, the car started fine. However, it would only idle for 30–60 seconds before stalling, and while driving it would feel like a “fuel cut” after a few seconds - though it wouldn’t fully stall. Test 2 – Strainer swap Suspecting the diagonal strainer might not be reaching the tank bottom, I swapped it for the original flat strainer and filled the tank with ~45L of fuel. The issue persisted exactly the same. Test 3 – OEM injectors To eliminate tuning variables, I reinstalled the OEM 270cc injectors and reverted to the original map. Cleaned the spark plugs again just in-case. The stalling and “fuel cut” still remained.   At this stage, I suspect an intermittent power or connection fault at the fuel pump hanger, caused during the cleaning process. This has led me to look into getting Frenchy’s fuel hanger and replacing the unit entirely. TL;DR: Cleaned and restored the fuel system (tank, lines, rail, pump). Tested 550cc injectors with the same resized-injector map as before, but the car stalls at idle and experiences what feels like “fuel cut” after a few seconds of driving. Swapped back to OEM injectors with original map to rule out tuning, but the issue persists. Now suspecting an intermittent power or connection fault at the fuel pump hanger, possibly cause by the cleaning process.  
×
×
  • Create New...