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Gtir Motorsport club » Tech room » Help and Advice » Lumpy Idle

Lumpy Idle

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1 Lumpy Idle on 14th April 2015, 4:43 pm

Supernova


Hi guys, having recently getting the Pulsar on the road for the Summer it seems to have a bit of a rough idle.

When you initially start the car the revs will sit at a steady 1500rpm, after running for a few minutes the car will creep back down to about a 1000rpm. At this point the revs will fluctuate slightly and occasionally drop down to near 500rpm but it never stalls. If you drive along then dip the clutch to come to a standstill the revs will drop down to about 500rpm but again will never stall.

Any ideas? I've replaced the plugs, i've ran some Forte injector cleaner through and will replacing the leads soon but is their anything else I should be checking? All in all the car is not in bad nick and all appears to be working ok.

Cheers Matt

2 Re: Lumpy Idle on 14th April 2015, 5:10 pm

PartyPete

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the one star club
the one star club
Try cleaning the maf, run some electrical cleaner through it pal

3 Re: Lumpy Idle on 14th April 2015, 5:18 pm

Mr B

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gtir technician
gtir technician
if cleaning maf element makes no difference check/clean the idle air valves.

4 Re: Lumpy Idle on 14th April 2015, 5:21 pm

Supernova


Ok thanks guys I will try that on the weekend to see if it makes any difference.

5 Re: Lumpy Idle on 14th April 2015, 5:24 pm

Mr B

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gtir technician
gtir technician

6 Re: Lumpy Idle on 16th April 2015, 8:35 pm

Supernova


Ok so I got around to cleaning the MAF element with electrical cleaner today and whilst I was at it I changed a couple of vac lines. Initially it ok but the revs kept dropping a bit, by the time I got near home the car wasn't right.

If I was driving along keeping the revs steady I could feel it hesitating by the time I got to the Garage to get some fuel it was trying to stall now if I start her up she just dies.

Any ideas? I don't think I damaged the element but obviously i've disturbed something.

7 Re: Lumpy Idle on 16th April 2015, 9:39 pm

nomad

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Admin
Admin
Maybe the maf needs re earthing ..... have you got a stock set up battery in the boot or still in the bay ????


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8 Re: Lumpy Idle on 16th April 2015, 10:41 pm

GTI-R US

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Management
Management
Do a fault code check on the car and write the codes down if any appear, erase the codes then take for a drive then redo the same test and see if any are recurring

Could be many issues causing this problem which is why I would do a code check first


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9 Re: Lumpy Idle on 17th April 2015, 7:45 am

Supernova


Ok Bob I shall try that when I get home from work

10 Re: Lumpy Idle on 17th April 2015, 9:16 am

Supernova


Bob do you have any working Z32 maf's about?

11 Re: Lumpy Idle on 17th April 2015, 4:41 pm

Supernova


Ok guy's so I have down a fault check and it came back with nothing. I have re-earthed and cleaned the maf and it's still the same and I have changed the leads and that's done nothing either.

I'm a little stumped now all I did was change 3 vacuum lines and clean the maf and now the cars running like a bag of poo. I need help.

12 Re: Lumpy Idle on 17th April 2015, 4:52 pm

Stu

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Admin
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Have you knocked one of the pips off on the inlet manifold?
Noticed one of mine had the top split and fell off while I was doing the vacuum lines...


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13 Re: Lumpy Idle on 17th April 2015, 5:17 pm

Supernova


Any things possible although I cant see anything. The car was running ok until I took the maf apart and cleaned it, even then I was ok until I got most of the way home now it's just very lumpy like it's missing or something.

14 Re: Lumpy Idle on 17th April 2015, 5:26 pm

Supernova


I've taken it for a quick blast up the road and back and tried a ecu fault check, I now get one long pulse followed by 2 short pulses which indicates faulty afm circuit. Soooo..... Does that mean I need a new maf.

15 Re: Lumpy Idle on 17th April 2015, 5:34 pm

Supernova


Just to add when I put my multimeter on the the earth terminal I was getting a resistance of 0.69, when I checked for voltage I was getting 14v on the right hand terminal and nothing on the left.

16 Re: Lumpy Idle on 17th April 2015, 5:42 pm

Stu

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Had the plug on the maf worked loose.
Or does the plug need cleaning also.


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17 Re: Lumpy Idle on 17th April 2015, 5:50 pm

Supernova


The plug hasn't worked loose but it just pushes on i'm not sure if it's supposed to have a retaining clip on it or anything. If I unplug it while the engine is running the revs pick up and the car is smoother.

I did give the plug a spraying with electrical cleaner.

18 Re: Lumpy Idle on 17th April 2015, 6:27 pm

Stu

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Admin
Admin
Clear the code and try driving it again. Then do a code check again.


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19 Re: Lumpy Idle on 18th April 2015, 12:49 pm

Supernova


Ok a bit of an update guys. I took it for a spin last night and although it was better it was still quite lumpy and hesitant especially on light throttle in first and second gear. Check for fault codes and it threw up a det sensor issue so I cleared it and went for another drive.

Today I decided to take it into work to have a bit of a play started it up and the car just wanted to die so I checked for fault codes and up came the set sensor again so I cleared it and the car ran better.

Got into work did an oil change, re-earthed the maf to the battery cleaned all other earths I could find, changed the fuel filter, took the idle screw out and sprayed some wd40 down the hole and tightened up some of the intercollegiate pipe work.

The result is after fiddling with the idle screw a little the car runs much better than it did 2 days ago, so that is a result but I would say it's still not 100%, it's still got a bit of a lumpy idle .

20 Re: Lumpy Idle on 18th April 2015, 1:07 pm

Mr B

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gtir technician
gtir technician
Remove the air valve assembly & give it a good clean, worth doing even if does not fully cure your issue.
Also check/set the tps switch.
Worth having new plugs & good leads plus dizzy cap & arm all checked/renewed.
If det sensor keeps cropping up, worth testing it/wiring-plug & perhaps fit a known good one or a new one.

21 Re: Lumpy Idle on 18th April 2015, 1:45 pm

Supernova


How hard is it to remove the air valve assembly? Do I have to take the plenum off or can I get to it with it on?


I've changed the plugs and leads and I've also got a dizzy cap and rotor arm coming but I gave the old one a quick rub with emery cloth just for good measures.

22 Re: Lumpy Idle on 13th June 2015, 10:12 pm

Supernova


I made a bit of a discovery today but I'm unsure what it means.

Basically my car is still a little lumpy on Idle worse when it's cold but still slightly present when it's warmed up. Also it smells quite rich and seems a bit flat midrange so I know somethings up.

So today I checked the tps voltage and it seems spot on, 0.5 volts closed and when I open the throttle it climbs upto 4.6 so it seems thats ok. Now if I disconnect the AFM plugs while the car is running the revs increase to about 1.5k but the stutter/lumpyness is no longer there it runs nice and smoothly. Why is that?

23 Re: Lumpy Idle on 9th July 2015, 9:23 pm

Supernova


Still not got to the bottom of this issue yet but I'm making progress although slower than I'd like.

So far I've replaced the plugs to a set of NGK BCR8ES gapped to 0.7mm, New leads although they made no difference so I've put the old one back on, New Dizzy and Rotor Cap, New Fuel Filter, A known working Det sensor from Bob, checked the TPS is working and set ok, Re-earthed the Maf and cleaned and checked all the others changed all the Vacuum hoses that I can see and get to from the from the front and had the timing checked and set to 20btdc.

None of this as yet to make a difference, it's still got a lumpy Idle and still has hesitation on light throttle. The car is running rich and stinks of petrol on idle and when you let of the throttle, I have brought a wide band but haven't fitted it yet I've also brought a set of Hoses for behind the Plenum, new Inlet and Rocker cover gaskets, a ECU temp sender and Injector seals to hopefully fit this weekend. I also have a brand new Lmbada just in case.

Tomorrow the car is booked in for it's MOT which I expect it to fail on Emissions so I really need to sort this one out.

I've also brought a Consult lead so that I can plug it in and see what is happening with all the sensors using Conzult free version. So once I had it all up and running I recorded a video to see what you guy's think and whether this what you would expect to see as I have little to no experience with this sort of thing.

http://vid1305.photobucket.com/albums/s552/theezenutz/IMG_1065_zpssohmqaxd.mp4

24 Re: Lumpy Idle on 9th July 2015, 9:33 pm

nomad

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Admin
Admin
I have no experiance with nissan consult ... hopefully somebody will be able to say if all is ok ... seems unlucky so far changing all those bits and no joy ....


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25 Re: Lumpy Idle on 9th July 2015, 10:35 pm

GTI-R US

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Management
Management
Your readings all look ok but hard to tell properly with your shakes arm camera skills in such a short time Laughing
Check your ignition timing as that seems to be hopping all over the place even at base idle and when you revved it rose to around 50 degrees which is way too much ignition advance So this could be what's triggering your det sensor.

Ast a punt I would go for either a dodgy lambda sensor or possibly a loose connection on maf plug, temporarily put a tie clip round it so it's pulled tight onto maf as the vibration can sometimes temporarily shake connection loose if there isn't a proper retaining clip fitted

Is this a stock car or has it been mapped ?


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