Compression ratio for jeep cherokee

code p 0307 is misfiring on no 7 cylinder ====causes --- engine mechanical fault ---wiring---ignition/ fuel system--injector --ECT/MAF sensor---ECM
look for low fuel pressure or ignition control module

old post and is key question on old jeeps
no engine stated. guess 4L
the ASD began 1990 to present.
the ANSWER IS BELOW.
the car did not have and ASD until your car was 100% Chrysler EFI. The goofy French EFI has none .
ASD and the 3 second rules and 6 to 8 failure classes to trip it.
none. some jeeps changed in 1993,

• 1986 - Renix TBI available on Jeep 2.5 L four-cylinder engines.
• 1987 - the new Renix controlled 4.0 L six-cylinder engine was rated at 173 hp (129 kW; 175 PS) and 220 lb·ft (298 N·m) of torque.
• 1988 - 4.0 L output increased to 177 hp (132 kW; 179 PS) and 224 lb·ft (304 N·m) of torque, due to higher compression ratio. Renix still TBI
• 1989 - Changed to Renix MPFI. (4 injectors now)
• 1991 - Chrysler Corporation (then the owners of the Jeep brand replaced the Renix control system with OBD-I-compliant control electronics, the Chrysler HO EFI) with check engine light.(and flash codes)

The rocker arms are 21 ft lbs for the 4.0 litre engine.

Go to this site for what you need;

http://www.jeepz.com/forum/engine/16923-six-cylinder-4-0-liter-jeep-engine-specs.html

If by chance your check engine light does not light up on your dash, when you turn your ignition on, then your ecu is in need of repair.

I would manually set it up to top dead center. (Rotate the engine by using a breaker bar and socket on the crankshaft pully bolt the same direction as it runs) with the front cylinder, #1, assuming you have a 4.0 liter straight six, spark plug out. Put your finger in the spark plug hole, and as the engine is turned by hand, you will feel "air pressure." This is coming up onto the compression stroke. With the piston at top, you are at top dead center. (Zero aligned for timing marks) Now remove the distributor cap, your rotor should be pointing at the stud for the number one plug wire.
Turning it will then move the rotor to the next plug to be fired.

95 LHS- 3,518 cc 3.5 liters 6 V front longitudinal engine with 96 mm bore, 81 mm stroke, 10.5 compression ratio, overhead cam and four valves per cylinder
95 Concorde - 3,301 cc 3.3 liters 6 V front longitudinal engine with 93 mm bore, 81 mm stroke, 8.9 compression ratio, overhead valve and two valves per cylinder

Some of the parts may enter change but they are diffrent. Best of luck!

That depends on which engine you have. On v8 engines you need to put a wrench on the tensioner pulley and pull it over. On six cyl and four cyl engines there is an adjustment bolt on the power steering pump. Loosen the pump slide bolts and turn the adjustment bolt that moves the pump in and out of adjustment. (bolt runs under the pump...long threaded rod with a bolt head)

1st I need to know what engine you have, 4.0L or 5.2L V8.

This Info taken from Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Grand_Cherokee
Hopefully this will answer your question.

The redesigned WJ 1999 Grand Cherokee shared just 127 parts with its predecessor. The structure was stiffened by PorscheEngineering for sharper steering and lighter weight. The spare tire wasrelocated from the side of the cargo compartment to under the floor togreat relief of owners. The two heavy pushrod V8 engines were replaced by chrysler's first clean sheet V8 since the 60's (SOHC aluminium heads, plastic intake), Chrysler's then-new PowerTech. Although this engine produced less torquethan both previous V8s, it was lighter and got much better fuel economyand provided similar on road performance figures (the 23 gallon fueltank was replaced with one of a 20.5 gallon capacity). The Inline 6engine was also updated in 1999. 10 horsepower (7.5 kW) was added byredesigning the intake manifold. The manual transmission was dropped with this model.
While other Jeep vehicles used the Mopar 5 x 4.5 bolt circle, thiswas the first Jeep following the 1987 Chrysler buyout to receive awider bolt pattern — 5 x 5. The 5 x 5 bolt pattern (also 5 x 127 mm),although common to GM rear wheel drive vehicles and light dutytrucks/vans, has spread beyond its use with GM (and Ford with their 1973 to 1978 LTDs and Lincolns). Chrysler first used the 5 x 5 pattern on full-size half-ton Dodge Ram pickups and Dodge Ramcharger SUVs in 1986.
A notable feature available in this generation was the automatic four wheel drive option called Quadra-Drive II.With three viscous clutches, it was one of only a few four wheel drivesystems at the time with triple locking differentals, joining thecontemporary Mercedes Gelandewagen, Mercedes Unimog and Magna SteyrPinzgauer, and the only one of the four with fully automatic operation,although the axle differentials could not be manually locked like inthe other three vehicles.
The 45RFE and 545RFE automatic transmission in the WJ was notable. It included three planetary gearsets rather than the two normally used in a four-speed automatic. Thisgave it six theoretical speeds, and it would have been the firstsix-speed transmission ever produced in volume, but it was programmedto only use five of these ratios. Four were used for upshifts, with adifferent second gear for downshifts. Although five of the six ratioswere used, Chrysler decided to call it a "4-speed automatic". In 2001,the programming was changed to make use of all six ratios. Rather thanhave six forward gears, the transmission was programmed to act as afive-speed with the alternate second gear for downshifts. The RPM at70 miles per hour (110 km/h) on a 545RFE is 2000 rpm, 200 rpm less thanthe 45RFE programming. 1999 and 2000 model year WJ owners can havetheir 45RFE transmission's programming flashed to enable the extra gearas both transmissions are physically the same. The 42RE 4-speedautomatic remained the transmission for the Inline 6 engine. It was notchanged from the previous model Grand Cherokee's.

could be engine mounts have to replace mine engine almost jumps outta the compartment