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What Could Thid Be ?

suburban drifter

By suburban drifter,
in General Maintenance

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suburban drifter Community Regular

suburban drifter

Posted
Posted

i have a problem with my rb25 atm ..when just crusing if i back my foot of the gas slightly thr revs will rise slightly ,say im doing a solid 2900rpm i back off it will go up to 3100 before it goes down...also some times it randomly doesnt wanna go past 4500 rpm as easy as i would like but other times it is sweet as ..any one know what could be the prob ..thanks

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89CAL Grand Master

89CAL

Posted
Posted

hmmm

thats a bit different, the only thing i can think of is if ur backing off and clutching at the same time you may be clutching just a slight bit before u take ur foot off and its just free reving a bit. If its doing it with no clutch and the car is actually accelerating slightly for a second when u take ur foot off then that is really weird

89CAL Grand Master

89CAL

Posted
Posted

Ok so for example your driving along in 4th gear (manual im assuming?) at lets say 60km/h and u remove your foot from the accelerator and the revs rise a little before going down?

try driving it hard say for exmple full throttle up to 4-5k rpm then take ur foot off and see if it does it

if it doesnt then i suspect its your aac valve perhaps otherwise...... hmmm

stock ecu?

if so try reseting that, its a weird problem your having and im just suggesting that as a general thing, It may be as easy as that but yeh your problem seems rather weird

G0DZLR Mentor

G0DZLR

Posted
Posted

does it happen lower in the rev range? whats your idle set at?

i know on a cold day when the auto-choke is active on mine, i can cruise along at about 5-10ks an hour without putting my foot on the accelerator. has been doing it since i had a 100,000 service on it, am guessing its becuase they cleaned the AAC valve and set the idle to 950RPM (instead of 650RPM stock NA)

either way, i find it handy, but dont get your backoff issue. could be to do with something around the throttle control/body/butterfly

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