98 Nissan Maxima runs good for about 5 minutes and then sputters, when I give it gas it seems like it is flooding or not getting enough gas. After this problem starts it will take a while to run good...
the egr on most cars , is a 50k mile service point (cleaning)
ever do the 60k mile tuneup (service sch. list? )?
if tuned up (spark parts, (list) all filters )
then it can be ? EGR sticking open, love to do that just before a stop sign, is its hallmark of messup.
So is the ISC (idle speed contr. valve,electric) this stick , yes clean it.
with all otto cycle engine, there are 3 simple paths.
1: good engine, (some fail hot only)
2: good spark (yes, tuneup deal)
3: bad fueling, yes, as you said, too lean or too rich.
if the engine is good, (compression good)
and the tuneup gives you good spark and good timing.
we land on bad fueling , in that order.
going backwards can result is 3 weekends shot.
so fueling, Ill pretend its fueling and that 1 and 2 are ok.
in the service manual they cover this with tests.
Is the check engine lamp on key on the goes out running,
if not, why not connect a scan tool, (USA answers, all mine)
In canada , the EGR and other errors (misfire) are ignored by the ECU (no CEL warning) so not posting country puts me in hand cuffs.
1: remove spark plugs. are the they soaked in fuel, 1 or all.?
2: if dry , good.
if wet , check for bad injector rates and root cause.
if dry. then you need a scan tool to see if 2 things are good.
1: engine idles hot, in closed loop, if not fix that.
2: light fast cruise, (no hill) does ECU hold Closed loop status.?
3: if those are ok, does the LTFT say near center.
most cars run -4% not -25+ or +25%
LTFT means long term fuel trim.
when running look for pending errors. and live errors and stored errors, they are called DTCs
Drive-ablity issues are the most complex , just before intermittent.
huge books exist on topic.
here is one more of the many,(misfire )
induction air leaks
what we call this is gathering evidence. (after the tuneup)
Oct 12, 2013 |
1998 Nissan Maxima