Question about 1988 Jeep Cherokee

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1988 jeep 4.0 battery installed backwards now cranks but wont start

Battery was installed backwards. now engine cranks but wont start. good fuel pressure, good spark. will fire when carb cleaner is sprayed into intake then dies. suspect fuel injection not working

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  • 231 Answers

Have you checked all ofyour fuses? usually when you hook up a battery backwads you end up blowing a fuse and or fry your alternator on older modeled vehicles as there is no protection for it.

Posted on Oct 18, 2008

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07 cherokee wont start


which engine option? 4 Liter>
fuses good?
does it crank robustly? full cranking speed, not slow and weak.
does it have spark ?
does spark last for more that 2 seconds cranking
does the ASD drop out cranking> (big clue there)
if it has spark and ASD holds, then try test fuel, does test fuel start
car , even if only for the magic 2 seconds jeep rule>>????

if ASD drops.? OUT.
http://www.fixkick.com/Jeeps/ASD.html

cheers and good luck,
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Since you do have A fully charged battery and also you do receive fuel smell after crank start and the car wont start,either you do have an Ignition fault means not giving the spark,advice remove the spark plugs and check whether are wet with fuel,see whether are black,if so change them and before start check by leaving an HT lead off a spark and use one of the old ones connected to the HT lead and earthed to the engine,ask somebody to start the engine checking for any spark comes out. If yes then put the HT lead back to the new spark on the engine and try. If ther is not any spark,then you have to go backwards from the HT leads to distributor,Rotor Arm,Electronic igniter,Coil if is fitted,Fuse and relay. Good Luck.

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Jiggle the wire connectors going in to the computer under the hood -- first check battery cables/terminal connections at battery -- beleive it or not, connection could SEEM good because you get crank & lights, but if it's faulty, loose, engine won't start - computer requires good solid voltage flow.. next check a fusible link very close to the battery off of the positive cable. check fusible link carefully. this could cause your problem for sure.

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1 Answer

My crwn vic wont turn over sounds like wants to start but wont has half tank of gas,where is fuel filter,and fuel pump? my car is 1988.


If it doesn't turn over it may be your starter going. or a weak battery. start with that first, insufficient fuel pressure won't prevent you car from cranking, but weak battery or bad starter will. If you can jump it and it starts its probably the battery if it doesn't crank then its probably the starter. Good luck

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Bmw 1988 325is engine stops running sometimes - not lack of fuel or battery, new fuel pump. Sometimes wont start, starter motor working well, good battery. Replaced fuel pump - same deal.


The number one problem with these cars is with clogged fuel filters. They must be changed regularly. When you say it won't start, do you mean it cranks but won't fire? That could be a fuel pressure problem due to a clogged filter.

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Its the key fob battery!

Mine had enough to open the doors etc but not enough to deactivate the immobiliser!!!

Jeep Northampton fixed it. Brilliant Garage, would recommend them to any Jeep owner, lovely people.

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1 Answer

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Did you have the same cranking with no start problem with original engine or did the problem begin when you changed it? I would check codes if you have not already, and would also clean business end of idle air valve (next to tps) DO NOT turn the end plunger while cleaning or it may not seat properly. Do not loose the rubber "o" ring while working either!

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