Question about 1998 GMC Jimmy

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98 jimmy four point three vortex will not fire until you let off the key. Acts like its out of time but has brand new timing chains and gears. The ignition mod tests good.

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Even though your ignition mod tests good, you should try a different one. The tests do not always show a fault. What is happening is, your ignition is not getting enough power to fire in cranking mode. The usual reason for this is a faulty module.

Posted on Mar 18, 2011

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My 98 gmc jimmy is running rough and back fires out the tail pipe ,timming chain ?


did you attempt to line up marks to see if indeed the chain skipped?

Jan 25, 2015 | GMC Jimmy Cars & Trucks

1 Answer

Timing set


Chain

Print


REMOVAL & INSTALLATION

4.3L, 5.0L, 5.7L and 7.4L Engines
See Figures 1, 2, 3, 4, 5 and 6

  1. Remove the timing cover. This will allow access to the timing chain.
  2. Crank the engine until the timing marks on both sprockets are nearest each other and in line between the shaft centers.



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Fig. Fig. 1: Crank the engine until the timing marks on both sprockets are in line

  1. On 1996-98 vehicles remove the crankshaft position sensor reluctor ring, if equipped. On 7.4L engines tool J-41371 or its equivalent puller must be used to remove the reluctor ring.
  2. Take out the bolts that hold the camshaft gear to the camshaft. This gear is a light press fit on the camshaft and will come off easily. It is located by a dowel. The chain comes off with the camshaft gear.



0996b43f80219acb.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Remove the camshaft gear retaining bolts


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Fig. Fig. 3: Remove the camshaft gear and timing chain
A gear puller will be required to remove the crankshaft gear.
To install:

  1. Without disturbing the position of the engine, mount the new crankshaft gear on the shaft, and mount the chain over the camshaft gear. Arrange the camshaft gear in such a way that the timing marks will line up between the shaft centers and the camshaft locating dowel will enter the dowel hole in the cam sprocket.
  2. Place the cam sprocket, with its chain mounted over it, in position on the front of the truck and pull up with the three bolts that hold it to the camshaft.
  3. After the gears are in place, turn the engine two full revolutions to make certain that the timing marks are in correct alignment between the shaft centers. Tighten the camshaft sprocket bolts (and nut on the 4.3L) to 21 ft. lbs. (28 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 18 ft. Lbs. (25 Nm). On the 7.4L, tighten them to 20 ft. lbs. (26 Nm) on 1988-95 models. On 1996-98 models, tighten the bolts to 25 ft. Lbs. (34 Nm).

When installing the crankshaft position sensor you must use install a new oil ring seal onto the sensor.
  1. Install the crankshaft position sensor reluctor ring (if equipped), onto the crankshaft until it is firmly seated against the crankshaft sprocket. On 1996-98 7.4L vehicles replace the reluctor ring with a new component.
  2. Install the front cover, torsional damper, water pump and the radiator.



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Fig. Fig. 4: A gear puller will be required to remove the crankshaft gear


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Fig. Fig. 5: Timing mark alignment-4.3L, 5.0L, 5.7L and 7.4L engines

Apr 20, 2013 | 1993 Chevrolet Suburban

1 Answer

How do set the timing for the balance shaft for distributor with the camshaft timing gear on a 1996 Jimmy 4.3 Vortex 4X4 ?


Pull number one plug out, put your finger over the cyclinder hole, have someone bump motor over untill the pistion pushes air out..now the crankshaft should be close too O. Put distributor in and point rotor to number one plug...


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Jul 05, 2011 | 1996 GMC Jimmy

2 Answers

Turn key can hear fuel pump run turn key to start my truck startes for two seconds and die do it three or four times will start will dun good for a week a do it again will run good three days do it again ...


Could possibly be the anti theft system. Check out this link. When the SECURITY fails, you should see a light on the dash that says security. A symptom of a failed anti theft is starting for 1-5 seconds and then stalling repeatedly. http://vatspasslockpasskeysecurityhelp.yolasite.com/

May 15, 2011 | GMC Jimmy Cars & Trucks

3 Answers

I have a 1997 GMC Jimmy, 4.3 v6, i have replaced timing chain


fuel pressure regulator it is located on the spider pump behind the throttle body

Feb 13, 2010 | 1997 GMC Jimmy

1 Answer

Timing Problem??


pull # 1 plug out,put screwdriver in cylinder head and see what mark you need to use, also on vortex there is a dot on the distributer gear that must be lined up with a lateral on the distributer ,so when it drops in it will be on # 1 firing cylinder

Apr 29, 2009 | 1997 GMC Jimmy

1 Answer

91 chevy G20


well not sure exactly why it wont line up use something to turn the crank and cam to appropiate position start sliding crank gear until cam gear is touching then start to push both at same time make sure your crank key and cam pin are bothin place On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another.

Feb 10, 2009 | 1992 Chevrolet G20

1 Answer

Set timing 1997 jimmy


Ok that's pretty simple Put cylinder # 1 on TDC= top dead center on the (compressionstroke piston all the way up). Mark on metal part of distributor (with marker) where the number one is on the cap( that's where the number 1 wire plugs in) Then in-plant distributor make sure that rotor point is pointed to #1 on the cap, turn distributor shaft until this is achieved or as close as possible try to center shaft so you can adjust... ****** or advance to fine tune after you in-plant distributor if needed. Contact if you need more help . Good Luck

Jan 05, 2009 | 1997 GMC Jimmy

4 Answers

Nissan navara 1986 2.4L petrol timing problem


For timing, on 1981 and later 4 cyl engines (from the Haynes manual):
1. Turn camshaft so both valves for #1 cylinder are closed, and turn the crankshaft so #1 piston is at top dead center (woodruff key should be pointing up).
2. Engage the camshaft sprocket (with stamped numbers facing out) into the timing chain, and install the chain around the crankshaft sprocket. The bright links on the chain should be aligned with the timing mark on the crankshaft sprocket (on the right side as you look at it) and with the number "2" stamped into the camshaft sprocket, which should also be on the right side as you look at it.
3. Install the camshaft sprocket onto the camshaft, aligning the camshaft dowel pin with the number "2" hole near the center of the sprocket.

For the firing order and wiring routing for the 8 plug 4 cylinder engine: (Plugs on the intake manifold side are coded "I", and on the exhaust manifold side are coded "E")

Wire to 1I should be connected to tower on the distributor facing directly to the front of the vehicle. Going counterclockwise from there, the order is (1I), 2E, 3I, 1E, 4I, 3E, 2I, and 4E.

Oct 09, 2008 | 1986 Nissan Pickup 4WD 1986

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