Question about Jeep Wrangler

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My 97 jeep 2.5 tj does idle around 1000 rpm but sometimes it drops off and on (surges )not alot my guess is clean the injectors and do gas treatment even i always run good gas ,(cap rotor plugs are all new with in amonth.to the best of my knowledge all is correct.Any ideas u have ,thanks.

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  • John-David Rott
    John-David Rott Feb 13, 2014

    Many times idle problems are caused by a dirty or bad IAC (Idle Air Control) valve. On your Jeep, the valve is located on the back side of the throttle body. One plug and two screws, the valve comes out. Pull the valve out, and clean the tip with some throttle body cleaner, and clean the throttle body as well with throttle body cleaner. Don't use carb cleaner as it can damage the coating on the throttle body. Reassemble, and you should be good to go.

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I think you're on the right track, have you replaced fuel filter recently? That and check for vac leaks at engine (vac hoses & intake hose - bellows)

Posted on Mar 25, 2011

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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

I just recently replaced the spark plugs and wires on my 97 jeep wrangler, and the gas millege seems to have gotton a whole lot worse. What do you think could be wrong with it?


I would check to see if the fuel filter is clogged. You may have a gas leak. Your fuel injectors may be leaking as well. Make sure the tires are at correct inflation. If they are low, you will use more gas. You can also drop a fuel injector cleaner into the gas tank to see if that will help.

Feb 23, 2011 | 1997 Jeep Tj

1 Answer

OBD test resulted in a "too lean bank 1" diagnostics. How do I adjust the air/fuel mixture on the 97 Tj, 2.5L, multi point fuel injected engine to meet required specs.


There is no fuel mixture to adjust,this is done by the computer,the fuel filter might be the problem,or the injectors are in need of cleaning,use a treatment for the fuel such as luas,this will clean them ,and use less fuel as possible when added,if this does not fix the problem,have the fuel pressure checked the lean burn can be from weak fuel pressure from the fuel pump.

Jun 04, 2010 | 1997 Jeep Tj

1 Answer

When started idels high about 2000 rpm then drops when hot cold ?


the iac probably has carbon built up around it this controls the idle speed try cleaning it first,if not it could be a bad iac or a vaccum leak that the iac takes some time to compensate for to control idle.

Sep 17, 2009 | 2002 Jeep Wrangler

2 Answers

97 Jeep cherokee sport won't idle


Sounds like the idle air control valve...buy a repair manuel and it will walk you through the steps to change it...it's not hard.

Jan 26, 2009 | 1997 Jeep Grand Cherokee

1 Answer

My idle is all over the place!


Have you tried cleaning out the throttle body and injectors with a cleaner?

Nov 05, 2008 | 1997 Jeep Tj

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