99 grand Cherokee 4.0 engine swap timing trouble????

Asked by Aug 20, 2016 at 09:53 AM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Motor blew in my 99 grand Cherokee 4.0 I bought a
2000 GC with a recently rebuilt motor but the
transmission was bad but the motor ran really good
less than 30,000 on it anyway I swapped motors
and got everything hooked up but when I went to
start it it's acting like its firing at the wrong time
back firing out the intake and so forth I've checked
pretty much everything in getting spark at the plugs
the only thing is that after I tried to start it I noticed
that I forgot the crankshaft position sensor bolt so I
put it in then I realized it didn't have the spacer on it
could this cause this problem also the vehicle set
since January so I'm sure the gas is bad could bad
gas cause it not to start and backfire out the
intake?? It's my daughters jeep and she starts her
freshman year of college this week so she really
needs this car so any input would be a godsend so
please help!   Thanks everyone for your time on this
never ending post.

1 Answer

97,095

The spacer is there to make sure the air gap is correct from the sensor and trigger pawl, check the end of the sensor and make sure it was not damaged during cranking, also bad fuel will cause pop back, shelf life of today's fuel just sitting in a fuel tank is at best 60 days without any additives.

Your Answer

Add photo

Related Questions

  • 99 grand Cherokee 4.0 engine swap timing trouble???? 1 answer

    Motor blew in my 99 grand Cherokee 4.0 I bought a 2000 GC with a recently rebuilt motor but the transmission was bad but the motor ran really good less than 30,000 on it anyway I swapped motors an...

    1999 Jeep Grand Cherokee Laredo 4WD

    -

    Maintenance & Repair

  • 02 grand Cherokee engine swap 1 answer

    I have an 02 jeep grand Cherokee lorado that had the 4.0 straight six and I was curious if I could swap to a 4.7L v8 without having to change my wiring harness and stuff because I blew a rod out a...

    2002 Jeep Grand Cherokee Laredo 4WD

    -

    Maintenance & Repair

  • Jeep Grand Cherokee Laredo, 4x4 4.0 L engine. 1 answer

    I just noticed yesterday, when I was driving the car, running an errand, I started to get a funny smell, like brakes burning, or like the emergency brakes were stuck. The engine runs fine, but the Je...

    1999 Jeep Grand Cherokee

    -

    Maintenance & Repair

  • Jeep grand Cherokee Laredo engine swap

    I'm replacing a dual cam 4.7L. and was told not all 4.7L cherokee engines are compatible. How do i find out if it is

    2004 Jeep Grand Cherokee Laredo 4WD

    -

    Maintenance & Repair

  • 99 Jeep Grand Cherokee electrical 2 answers

    Hello all, for some time now my 99 JEEP Grand Cherokee has been acting up. First it will start by the Air Bag and Check Engine lights flashing on and off randomly. Then some more may flash on and o...

    1999 Jeep Grand Cherokee Laredo

    -

    Maintenance & Repair

Search Jeep Grand Cherokee Questions

Jeep Grand Cherokee Experts

#1 inuevafreak
inuevafreak
Reputation 2,100
#2 Tom Demyan
Tom Demyan
Reputation 1,890
#3 thejeepdoctor
thejeepdoctor
Reputation 1,770
View All

Related Models For Sale

Used Jeep Cherokee
356 Great Deals out of 40,170 listings starting at $1,500
Used Ford Explorer
913 Great Deals out of 63,673 listings starting at $799
Used Jeep Wrangler
274 Great Deals out of 15,790 listings starting at $3,795
Used Toyota 4Runner
223 Great Deals out of 19,177 listings starting at $2,300
Used Dodge Durango
274 Great Deals out of 21,016 listings starting at $1,500
Used Chevrolet Tahoe
588 Great Deals out of 33,016 listings starting at $1,500
Used Ford F-150
2,088 Great Deals out of 192,330 listings starting at $290
Used Chevrolet Silverado 1500
1,935 Great Deals out of 182,327 listings starting at $999
Used BMW X5
461 Great Deals out of 14,705 listings starting at $1,499
Used Chevrolet Camaro
373 Great Deals out of 31,227 listings starting at $2,500
Used Ford Mustang
682 Great Deals out of 44,475 listings starting at $1,500

Used Cars For Sale

2018 Jeep Grand Cherokee Laredo 4WD For Sale
37 listings starting at $40,085
2017 Jeep Grand Cherokee Laredo 4WD For Sale
8 Great Deals out of 7,099 listings starting at $25,000
2016 Jeep Grand Cherokee Laredo 4WD For Sale
13 Great Deals out of 501 listings starting at $21,970
2015 Jeep Grand Cherokee Laredo 4WD For Sale
22 Great Deals out of 747 listings starting at $18,599
2014 Jeep Grand Cherokee Laredo 4WD For Sale
21 Great Deals out of 995 listings starting at $13,688

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.