Question about 1995 Jeep Grand Cherokee
You have a mess on your hands .If you ever want to store any kind of gas engine you need to put fuel stabelazer in the gas and run it for for some time at high speed conduitions as well as low speed before you walk away from it .
The best advice I can give is remove the air cleaner get it all off the top of the engine.Take some HI test gas poor an ounce or 2 the engine see if you can get it running and keep it running for 30 sec if you can get that out of it .It WILL WORK .
Then do a complete tune up all wires cap rotor pcv plugs check belts the hoses belt tenisioners radiator antifreeze engine oil transmission oil keep pouring gas down the bearral then start with the carb cleaner and injector cleaner if it runs for any extended time.Your not supposed to do things like this to engines if you expect them to run.
Posted on Apr 15, 2015
Pull the throttle body and clean it thoroughly, replace the injectors.
Posted on Apr 15, 2015
Try some Sta-bil in the tank with fresh gas, it is made for dissolving the gel that results old gas. You can buy this at any Auto parts store. I would try this fist as I have had excellent results from this product. It will dissolve the gel.
Posted on Apr 13, 2015
All the fuel in the EFI parts will be gummed up.
the injectors have 10 micron size screens inside.
they will be clogged.
we start at the tank and work forward, cleaning ALL that.
a new fuel filter will be needed.
next time drain all fuel out. first. save a bundle.
E10 fuel makes this worse) usa has Ethanol in it. bad .
at the worst remove all injectors and have them pro cleaned
using ultra sound, they back flush them to clean them.
Posted on Apr 13, 2015
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
First things you need are a digital multi-meter and a chilton or haynes manual (together, both are far cheaper than the first incorrect diagnosis you may make)
Second, you will need time to first study the manual and run diagnostic tests on each component.
Every engine needs fuel air and spark in order to start and run Air is pretty much a "given" unless there is a big fat woodchuck stuck in the air filter box. Air flow is regulated by the throttle body which simply opens and closes when you press down on the gas pedal.
(which should really be called the air pedal)
The computer sensors see the internal conditions: TPS "watches" how far you have depressed the pedal. Computer sees that info and changes fuel delivery ans timing according to info from there after comparing info from other sensors, MAP measures the difference in external (ambient) air pressure and compares it with manifold vacuum.Map sensor info translates to proper shift points, engine timing changes and fuel delivery etc. Manifold air temp, measures exactly that.
Coolant temp sensor monitors the engine temp by measuring coolant temp Crank position sensor sends a signal telling the computer exactly where (what position the crankshaft is in) And cam position sensor tells the computer what the position of the camshaft is.Usually an engine will run with a bad sensor except for the tps, cam sensor, and sometimes map sensor. Your asd relay needs a signal from the crank sensor (through the computer) or it will not permit fuel to reach the injectors and will also prevent spark. The cam sensor does much the same thing. Crank Position sensors have a relatively high failure rate so I'd look at that first.
O2 sensor(s) measure the amount of O2 present in the exhaust and send that info to the computer which alters fuel delivery to attempt to keep exhaust "in range" of pre-set parameters.
The IAC (Idle air control) is not a sensor. It responds to what the computer tells it to do in regards to keeping the air in "balance" with fuel flow at idle.
Carburetors remained relatively clean because the fuel and air was mixed there and sent down to the combustion chambers. With injection, only air goes through the throttle body and that leads to "crud" deposits that can obstruct the valve or keep the plunger off the seat and alter the air/fuel mixture. Passageways need to be cleaned and the plunger end as well...but, never turn the plunger while doing that.
The computer takes all the information and uses it to maintain proper spark control and fuel delivery for every load condition.
The computer needs a good connection to all sensors, a good power supply and good ground.
Always check those things before testing. A bad connection in the ignition switch can cause a low or no current condition at the computer. Your engine has two main grounds (battery to block and block to firewall) but also has several smaller ground connections on the fenders and block, all of which need to be clean and secure. Always test with a known good fully charged battery or no test info is valid. All fuses need to be tested before running any other tests.
Bottom line: A shop needs to do the same testing I mentioned that is in the manual. A shop also has a hand held or larger scanner that helps them run tests faster.
Find out whats missing (spark or fuel) and work first on items that make that happen.
Most common failure is the CPS. Fuel pump is second in line, but if you hear it running likely it's good (but make sure the fuel is reaching the injectors...a dirty fuel filter can prevent that)
Guessing gets expensive and the manual will come in handy for many repairs later (never a bad thing to have)
If you have any questions along the way just ask and I or someone else will give you an answer.
Most times running a full diagnostics can be both annoying and frustrating. Keep away from sledge hammers the urge to use them may overcome you but if you stay with it, you can find your problem.
Posted on May 26, 2010
Testimonial: "Very knowledgable. he explains stuff in a language you can understand and seems to know what he is talking about. Too bad he dont live near me...i would make him my mechanic;0)"
Tips for a great answer:
Aug 14, 2015 | Cars & Trucks
Feb 04, 2014 | 1987 Oldsmobile Toronado
Dec 05, 2013 | 2000 Ford Explorer
Oct 30, 2012 | Ford Cars & Trucks
Feb 09, 2011 | 1997 Buick Park Avenue
Nov 26, 2010 | 1991 Buick Park Avenue
Oct 02, 2010 | 1995 Chrysler Sebring
Sep 05, 2008 | 1998 Jeep Cherokee
Jun 12, 2008 | 1990 Honda Accord
May 25, 2017 | 1995 Jeep Grand Cherokee
41 people viewed this question
Usually answered in minutes!