Question about 2002 Nissan Sentra

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This is a friends car, he's a starving student so he came to me for help. I'm a Honda tech so I'm not familliar with Nissans. The engine will surge slightly at idle 700-1000 RPM. I suspected a vacuum leak. The tach jumps like its missing badly but there is no misfire that I noticed. I checked for codes and found Injector Air Assist Problem. I couldn't locate a solenoid to check. Any help would be greatly appreciated.

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  • waynebutt01 Dec 18, 2008

    I know on the Honda's there is a thermostatically controlled air assist valve that controls the injector air flow when its cold. if its stuck open it will act simillar to a vacuum leak. Since it's throwing a code for it I guessed I'd check it. But I dont even know where it is!! or what it may look like.

  • Roberta Smith
    Roberta Smith May 11, 2010

    the jumping would indicate vacuum issues.... although on one car i owned the vacuum issue was caused by a stuck valve....

    just putting in my two cents ... i'm sure someone more knowledgable then me will be along shortly.



    Robert

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Only thing i suggest as you have narrowed it down... is to call or drop into a nissan dealer... the mechanics there should be able to tell you.... heck the parts guy can show you one and then you'll know what to look for... my parts guy at ford gives me print outs that are detailed and show part locations...

Robert

Posted on Dec 18, 2008

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When I start my odyssey it starts surging. I found a small rubber hose on the right side of the engine, but don't know where the other end of the hose goes....Help


WHAT COUNTY???????????????????????????????????
hot engine, cold or both?/// a key question
WHAT ENGINE: ( usa list , ONLY)
2.2 L F22B I4
2.2 L F22B6 I4
2.3 L F23A I4 2.3 L F23A7 I4
the fsm covers this. hose thing.... all hose can be followed,
unless its axle vents on 4wd cars. (they go no where, special)
is surging the only symtom.?
no engine stalls.?
lack of power in any gear or hills.
no misfiring?
no flooding.?
starts easy/?

ok what is surge, that it really is idle controls bad or out of comtrol
1: idle controls bad. (isc dead?)
2: or engine is running way too lean, and ISC cant keep a grip on idle.

easy huh?
and #3 misfiring so bad the idle controls fail.
are all fuses good?
is the CEL lamp glowing , then goes out running engine.
no , the scan it. or do the flash DTC codes trick.

a good tech ,first finds out if the engine holds closed loop status
hot. at idle, if not, he fixes that first.
as he/she knows that idle is the last thing to work right, in EFI.

one other way to get surge is air leaks (aka. vacuum leaks)
if the engine (unsaid option) is MAP based, it will race fast
with any vacuum leak, and it dont take much of a leak
to make the ISC idle controller go nuts.

so repost , hot/cold both questions
and actual RPM numbers. we need numbers
is the dash Tachometer missing. ????
and what engines in car.

all lean engines surge.
all ISC systems can surge if out of control , not all do this. just 1/2
if the ISC surges, it means its trying hard to gain back control.
this is called a software servo loop.
The ECU is programmed to hold rpm near say 800 RPM hot.
and is very digressive in that role.
I have a 91 car that will surge, with any vacuum leaks.
(by design) depends on which engine.

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http://honda-tech.com/tags.php?tag=p1362

505 is (bad idle)
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(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
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it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
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examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
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cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
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MAP is speed density EFI.
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