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TD42 slow to drop revs

Tech Talk for Nissan owners.

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Posts: 7
Joined: Thu Mar 08, 2007 6:37 pm
Location: shepparton victoria

TD42 slow to drop revs

Post by dunno »

When my engine reaches about 2000+ revs it's really slow to drop down when I decellerate.
I have tryed free reving it from the fuel pump under the bonnet and the lever seems to be returning ok it's just dosen't seem to be dropping revs quick.
apparently the fuel pump was reco'd not long ago so I'm hoping it's nothing to major.
anyone got any idea's??
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Posts: 7
Joined: Thu Mar 08, 2007 6:37 pm
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Post by dunno »

should also say its a 88 mav with custom turbo set-up
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Post by Z()LTAN »

too much fuel mate, leaking injectors or its eating oil
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Joined: Thu Mar 08, 2007 6:37 pm
Location: shepparton victoria

Post by dunno »

dosn't seem to be blowing any smoke.
when it started happening i was half way round the block, it was like it whent from fine to this.
Just thinking :?: could it possibly be a turbo thing??
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Post by 300WinMag »

If you over ajust the fuel screw this will occur. Try backing it off half a turn.
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gq

Post by purplebus »

take the accelerator cable off the pump end and free rev it to see how quik it returns to idle. my td42t did this and i replaced the acc cable for about $25 fron nissan. my cable was full off mud somehow. :lol:
only the first roll hurts, then its a ride..
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Post by 300WinMag »

Also I forgot to mention to check return spring tension. My pump throttle had poor tension when I recieved it and I found one of the return spring tails wasn't fitted behind its stop correctly.
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Post by dunno »

I've tried disconnecting cable and reving from pump so thats not the problem. return spring also looks to be working good :?:
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Post by 300WinMag »

I would give Andy Diesel tech a PM, he's the subject matter expert for pumps and injectors.
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Post by Rhysta »

If your fuel pump is maxed out, the governor spring struggles to return to 0 fuel ( foot off the pedal ) due to the amount of fuel being pumped against it.

Do some pump mods and then you wouldn't have this problem, ( with the same Air fuel settings ) obviously the same thing can occur if you max it out again with a larger plunger.
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Joined: Thu Mar 08, 2007 6:37 pm
Location: shepparton victoria

Post by dunno »

Backed fuel screw off 1/3 of a turn and the problem seems to have gone. seems strange for it to all of a sudden start playing up? thanks for all the replies.
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Post by Burra Boy »

dunno, could it be the air conditioning idle step up? I just upped my fuel delivery after fitting a turbo and IC and found that the step up was holding the idle up. Just my 2c worth ;)
Burra Boy. 1x 89 LWB wagon, turbo, frozenboost IC, lots of stuff. 1X 90 leafie ute, AXT turbo, tough as nails and about as comfie...
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