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


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

Search Jeep Grand Cherokee Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Jeep Grand Cherokee Experts

#1 inuevafreak
Reputation 1,890
#2 Tom Demyan
Tom Demyan
Reputation 1,690
#3 thejeepdoctor
Reputation 1,560
View All

Related Models For Sale

Used Jeep Cherokee
334 Great Deals out of 52,604 listings starting at $2,200
Used Ford Explorer
1,206 Great Deals out of 71,146 listings starting at $1,000
Used Jeep Wrangler
490 Great Deals out of 17,960 listings starting at $2,950
Used Toyota 4Runner
341 Great Deals out of 20,328 listings starting at $1,250
Used Chevrolet Tahoe
852 Great Deals out of 28,369 listings starting at $1,700
Used Dodge Durango
379 Great Deals out of 22,648 listings starting at $1,500
Used Ford F-150
3,210 Great Deals out of 205,087 listings starting at $1,779
Used Chevrolet Silverado 1500
2,743 Great Deals out of 149,176 listings starting at $1,500
Used BMW X5
474 Great Deals out of 15,344 listings starting at $2,899
Used Chevrolet Camaro
475 Great Deals out of 39,922 listings starting at $3,499

Used Cars For Sale

2017 Jeep Grand Cherokee Laredo 4WD For Sale
4,692 listings starting at $26,474
2016 Jeep Grand Cherokee Laredo 4WD For Sale
8 Great Deals out of 1,368 listings starting at $23,957
2015 Jeep Grand Cherokee Laredo 4WD For Sale
13 Great Deals out of 509 listings starting at $20,599
2014 Jeep Grand Cherokee Laredo 4WD For Sale
22 Great Deals out of 891 listings starting at $14,995
2013 Jeep Grand Cherokee Laredo 4WD For Sale
21 Great Deals out of 489 listings starting at $12,983