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Jeep cherokee fuel problems

I have given my 97 Jeep cherokee a complete tune up and new injectors, new fuel pump, and cylinder 1 misfire is still poppin the check engine light. I started with just replacing the #1 fuel injector and it went away then I decided to get all the injectors replaced about a month later and now after doing that the check engine light is coming back on with cylinder 1 misfire, also I just replaced the fuel pump and dump out all the gas before putting the new one in and now when I shut the engine off it make a glugging sound in the tank?

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Did you check inside the tank for sediment?

Posted on Mar 05, 2009


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I have a 1999 Silverado 1500 2WD, it misfires @ 2nd and 3rd shift point until it reaches 210 degrees then the misfiring completely goes away. I have given it a complete tune up. Any ideas??

joking they all do/ really,! but yours is outside normal.

the OBD2 DTC codes clear, no P0300s at all, or the like?

cold misfire.
new spark plugs , using OEM type plugs and gapped to factory spec. not to Autozoned spec. they lie.

misfire can be many reasons
even a leaking EGR main valve.
1: low compression any cylinder. (compression gauge)
2: bad spark (look for OBD2 pending P030x)
3: bad fueling, (injector balance tests)

there are tests for each , all are simple.
injector clogged or leaking?

is the fuel old?
try techron fuel additive, (i hate additives) but this one is just
more benzine that is already in all chevron fuel. so is 100% safe.
run that, read bottle for rates.
the misfire is real, it can be found.
the first question, is it all 8 cylinders or just 1.
we can do a spark shunt test to find cylinders that are dead
during the misfire.

Oct 08, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Rough idle random cylinder misfire

misfires are more from problem injectors, low fuel pressure or injector wiring than from plugs
have a fuel pressure test done to check for problem pressure regulator , problem fuel pump , blocked m/dirty filter
one other area of concern is the EVAP system where the purge valve doesn't vent the tank properly and causes low fuel flow rates

May 27, 2017 | 1999 Jeep Grand Cherokee

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I hava jeep 97 jeep grand cherokee laredo203,000 miles problem is i gotta misfire that i cant get rid of replaced spark plugs,distributor cap and button cleaned fuel injectionand it keeps coming back what...

What is the misfire code?

If it is a specific cylinder try swapping the injector with another cylinder. If the misfire follows the injector to the other cylinder than you know the injector is bad. If it doesn't follow than I would be checking compression on that cylinder.

Oct 27, 2010 | 1997 Jeep Grand Cherokee

1 Answer

I have problems with Misfire detected in multiple

The misfire is probably due to the lean condition.

The lean condition has several possible causes...
1. plugged fuel filter
2. fuel pump failing
3. fuel pressure regulator failing or stuck
4. injectors plugged

A good course of action is to replace the fuel filter, then run some fuel system cleaner, such as sea foam, through it. If that doesn't do it then check fuel pressure and diagnose whether it is the pump or the regulator.

Apr 28, 2010 | 1999 Jeep Grand Cherokee

3 Answers

P0308 cylinder 8 misfire detected? How to repair?

Fuel injector cleaner commonly has a low success rate, and will not help if it's more than one cylinder that is missfiring. The fact that you have a "rattle" noise, leads me to beleive the engine is not receiving fuel on one or more cylidners. If it is all the cylinders, than the fuel pump may be the culprit, or the fuel pump circuit. But if only one cylidner is missfiring than it is a possibly an injector. A code P0300 refers to all cylinder missfires, and any code between P0301-P0308 distinugiushes a particular cylinder.

1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

Mar 05, 2010 | 1997 Jeep Grand Cherokee

1 Answer

When it idles the vehicle shakes. it idles rough

It sounds like there may be a cylinder misfire... .basically a misfire is when a cylinder does not fire correctly, This can be caused by faulty spark plugs,coil packs,dirty fuel injectors,clogged fuel filter,or bad cylinder compression. When was the last time you gave it a tune-up? I would lean towards changing the spark plugs myself. good luck

Feb 27, 2010 | 2000 Jeep Cherokee

3 Answers

1999 jeep cherokee 6 cylinder engine light

2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,

Dec 12, 2009 | 1999 Jeep Grand Cherokee

1 Answer

2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder

Plug, plug wire, plugged or open fuel injector. are the most likely.

Sep 28, 2009 | 2001 Jeep Grand Cherokee

5 Answers

Number 1 cylinder misfire

fill up the gas tank and add some fule injector cleaner
that solved my problem with misfire in cylinder 1
took about 2 days and my engine light went back off
i used a brand called
lucas fuel injector cleaner
i got it from advanced auto
auto zone also carries it

Nov 20, 2007 | Jeep AM/FM Cassette with CD Changer...

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