Question about 2000 Toyota Tacoma PreRunner

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Maf?/ missfiring rough idling, engine would bog down, varying between, 400, and 1200 rpm, and steady out when throttling up started off with what seemed like misfiring, read a 300 code on obd2(random misfiring), changed plugs, problem continued, now with 100, 110, codes, MAF sensors any ideas?

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Have the map sensor checked to see if it is within range you say you have codes maf make sure all clamped duct work is tight and not loose clamps .iac motor clean bore if the pintle gets stuck will cause rough idle hesitation even no start conditions scan tools only test the idle air control valve motor not the bore that extends to block varnish gets built up on the pintle and in the bore wich binds the in and out operation

Posted on Sep 12, 2008

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1997 nissan bogs down at 200 rpm check engine light is on but dont know the code The truck will sit and idle all day but once put in gear and driven will bog down at 2000 rpm in all gears Was told it was...


Check the fuel pump output. Some will work but not have enough output for the instances you describe. Find a place that can test the fuel pump pressure.

Mar 24, 2014 | 1997 Nissan Pickup

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Wont rev 3000 rpm


You can continue replacing parts at random or have a competent diagnosis made to identify probable causes of the problem(s).

Mar 24, 2014 | 1997 Nissan Pickup

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97 toyota surges at an idle


(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
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.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
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..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


Jan 07, 2014 | 1997 Toyota Tacoma

1 Answer

Bank 1 and 2 rich, rough idle. Have replaced upper and lower intake gaskets, TB gasket, MAF sensor, throttle position sensor, EGR valve, all 4 o2 sensors, both cats, all 8 fuel injectors, fuel pressure...


I'm going to assume the temp sensor is reading normal ?
And there is no restriction in the return line to the tank ?
Any chance there is excessive fuel in the oil ?

Aug 27, 2013 | 1997 Chevrolet K1500

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92 jeep wrangler 4 cyl 5 speed skipping and bogging down idling rough replaced fuel pump/filter injector o rings fuel pressure regulator timing chain distributor plugs wires map sensor crank sensor idle...


Have you checked the cam sensor? Also does that vehicle have a "throttle position sensor"? Some cars use both MAP and MAF sensors, not sure about your particular vehicle but if it is one of those, cleaning the MAF wouldn't hurt. Good luck.

Jun 28, 2012 | Cars & Trucks

1 Answer

2001 nissan maxima gle it bogs down when i press on the gas,idles low at .5 rpm,dies when i start it i have to keep my foot on the gas,lights run dim when i come to a full stop it has 155,000 miles


Hi and welcome to FixYa!

As a first course of action, I strongly suggest that you replace the MAF (mass air flow) sensor and the TPS (throttle position sensor). If the MAF and TPS is faulty the RPM tends to go down or goes erratic. The MAF and TPS is located at the throttle body which is secured by small screws or bolts. It is visible which can easily be seen.

Once replaced you'll be good. Hope this helps and thank you for using FixYa! Have a good one!

Feb 27, 2011 | 2001 Nissan Maxima

1 Answer

Ngine over fueling at all rpm, rough idle, heavy fuel consumption


if the car is stock i would replace your oxygen sensor. you may also need to clean out the MAF sensor.

May 29, 2009 | 1995 Volkswagen Golf

1 Answer

Idle varies way too much


try replacing your map sensor or your throttle position sensor.

Nov 23, 2008 | 1990 Honda Civic

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