Question about 1984 Jeep CJ7

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Setting distributor jeep wrangler 1997 4L

Removed the distributor and lost the position can anyone help to set timing again

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  • luke_currin Dec 28, 2008

    thanks budy have a new one the revs keep changing at idle and surges intermediately when driving but comes good if you keep your foot on the gas so it not fuel can you help

  • John Jon May 11, 2010

    well usually you put it back in when #1 cylinder is top dead center then slip distributor shaft in with rotor aimed and locked to #1 post ign wire!!! you should be careful!!! valves are delicate!!!

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  • Jeep Master
  • 6,982 Answers

I'm going to assume that you have some idea where the rotor was pointing before you took unit out.
Turn the crankshaft by hand 'till you find the small notch on the back edge of the pulley. Mark the notch with white crayon. Turn the crank untill the mark you made lines up with "0" on the scale on the right side (facing engine) at about 2 oclock. (sometimes needs to be cleaned off to read it) You are now either dead on or 180degrees out of phase. (rotor will be pointing directly away from where you think it should be if it is 180 out). If close to original location, make a mark on outside of dist housing, directly below #1 ign wire post. Remove cap and check that rotor is aligned with the mark you made. If it is not, remove distributor part way, till you can feel the drive gear just disengage, then turn rotor towards the reference position. Once positioned, push distributor housing back down into block. If it does not drop down fully, have someone turn the crank by hand two full turns back to reference mark while you push gently down on distributor. when the oil pump shaft engages, dist will drop down.
If you found dist to be 180 out, remove it and turn rotor to proper position, then follow instructions above.
The timing is non adjustable on these engines.(timing is changed by computer) There is a single bolthole in the dist retaining ear (part of dist housing) When checking reference points, always keep this hole lined up with bolt hole in block. Before attempting to start engine, make sure that after everything is bolted down, your reference marks match!
There are several other ways to do this. This is the most simple and safest way. as at no time is the ignition key in the "on" position, while making these adjustments..
Turning the engine with the key "on", even by hand, & even with the timing out of phase can result in "kickback" which can and usually does hurt someone.

Posted on Dec 27, 2008

  • Richard Scordino Dec 28, 2008

    First, (should have asked this before) WHY did you remove the distributor in the first place? Were there similar performance problems before you r&r'd it? Even in person, hands on, I'd have to do testing to determine your current problem. First, check all vacuum hoses to make sure they are connected and not cracked anywhere. 'Though your problem could be caused by just about anything in the engine management system (all sensors feed off of each other in a sense that they all feed the main computer, incorrect info at any point causes the computer to try to "compensate" throwing everything else out of whack) Therefore, Id start by doing some testing either with a good digital ohmeter, or a scan tool. Get a decent manual for an outline for individual test procedures. Write down everything you find, and compare to specifications. On 97 and earlier systems, you have some "on-board" tests you can do: Turn the ignition key to "on" three times, leaving it in the "on" position the third time. Don't crank the engine, just turn the key.The check engine light will flash stored codes. eg: one flash followed by a pause, then two flashes = 12.
    Any good manual will have definitions of code #s in it.eg: 12 means that the battery was disconnected within the last fifty times you started the engine. (Since you were just working on it, I would likely ignore that one!) In my opinion, I'm thinking that your problem MIGHT be the MAP sensor, or mass air flow sensor (if yours has one) but without testing, I would not just run out and buy one. If you have a friend with a similar vehicle, you could swap it out just to test. Another common part that gives wierd problems is the crank sensor. But, without testing, I'm just guessing!
    Good luck


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How can I time a distributor without a timing light or wheel on a skid steer?


is this a points distributor
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- Remove the distributor cap.
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Take note of the position of each plug lead. Mark them with whiteout or tape and a pen if they have no distinguishing marks, or if you are unsure of their relative position.

Using a timing light on cylinder No.1, take note of the present timing marks on the crankshaft pulley with the vehicle up to temperature and running. You also need to take note of the engine revolutions when checking. Using paint, or a scribe, mark where the old distributor is aligned in reference to the engine head. These will serve as an approximate reference when refitting the new one.
Once your notes and marks have been taken, assuming you have no instructions on what the timing and rev range should be normally, then you can procede with the removal of the distributor.

Take off the distributor cap and take note of the position of the rotor arm and which direction it is pointing to. You will have to align the new distributor's rotor arm to the same point before installation.
Many distributors have two locating/locking bolts. You can remove these both, then pull out the distributor. It may require a bit of coaxing as it has a rubber sealing ring on it's shaft which may make it stiff when removing.
As soon as the distributor comes out you will notice that the distributor's drive shaft has two metal lugs which slot into the camshaft. Those metal lugs on many Japanese models are offset, allowing you only one way to fit the new distributor, or in other words, to make it impossible to set the distributor 180 degrees in the wrong direction. This is not always the case however, which is why taking note of the rotor arm earlier was important.
When refitting a new distributor it is often wise to fit it with a new rubber shaft seal. Apply a little rubber grease when refitting, or a smear of engine oil, making it easier to slide in.
Once in, roughly align your distributor at the angle the old one came out at, then secure lightly with one of the retaining bolts. I say lightly, because you will need to turn the distributor later to set the timing.Replace the cap and leads.
Often there is a sticker under the hood/bonnet which tells you what the timing should be at which engine idle rev range.If you are having problems keeping the engine at that specific rev range, then disconnect the idle control valve wiring connector and have someone sit in the vehicle to manage the throttle by the pedal.
Make sure the vehicle is up to temperature once again. The engine may run a little rough at this point, as your timing isn't set yet.

Referring to either your own notes or to the sticker under the hood, use the timing light again and turn the distributor until the crank shaft timing marks align to the correct position, then secure the distributor's locking bolts.


Run the vehicle for a few hours or days, and check the distributor for any signs of an oil leak. An oil leak generally occurs if the shaft seal ('O' ring) is not fitted correctly or if the rubber is damaged/perished.


Good luck!

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You will need to adj. your timing to do this>

REMOVAL

  1. Disconnect distributor pickup lead wire at wiring harness connectors.
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85128526

Basic ignition Timing Adjustment 3.9L Engine

  1. Locate and ground out the carburetor switch idle stop contact with a suitable jumper wire.
  2. Disconnect and plug the vacuum lines at vacuum transducer on the SCC and the air switching valve on the emissions air pump.
  3. Set the gearshift selector in park or neutral and apply the parking brake.
  4. Using a magnetic timing unit, insert the pickup probe into the open receptacle at the left of the engine between the power steering and the water pumps. If a magnetic timing unit is not available, use a conventional power timing light connected to the number one cylinder spark plug wire.
  5. Bring the engine to a normal running temperature. This can be done by allowing the engine to idle for 5 to 10 minutes when the ambient temperature is around 21°C (70°F).
  6. Adjust the engine idle rpm to the specifications on the VECI label in the engine compartment.
  7. Check the basic timing when using a power timing light). If the basic timing is correct, remove the jumper wire, reconnect the vacuum lines and disconnect all test equipment. If the basic timing is NOT correct, proceed to step 8.
  1. Loosen the distributor hold-down bolt allowing the distributor to be turned with some resistance and adjust the basic ignition timing to the specifications on the VECI label. After adjusting the basic ignition timing, recheck the idle rpm and secure the distributor. Recheck the timing once again to verify that the timing is correct.
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1 Answer

How do I reset the timing on a 1994 ford ranger?


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1 Place Transmission in Park on Manual (Neutral and set Park Brake
2 Ensure all accessories are off AC ,Heater, Radio, ETC...
3Connect an inductive timming light and Tach to the Engine according to manufactures instructions
4 disconnect the single wire inline spout connector or the shorting bar from the double wire spout connector( should be located near hood hinge on fenderwell drivers side small Gray plug with pc of Tape around it ) or near distributor
5 using a pc of yellow chalk laying flat onto the Crankshaft harmonic balancer and marking the entire timing marks area this will make it easier to see the correct timing marks
6 Start engine and bring to normal operating temp.
7 Check Idle speed and adjust if needed this should be non adjustable on your vehicle
8 Check initial timing by aiming the timing light at the marks and pointer.see emissions label under hood for exact timing Specs.
9 if the marks don't line up shut down engine
10 loosen the hold-down bolt on the distributor base but not so much that the distributor turns when assistant restarts the engine
11 restart engine
12 have assistant aim timing light at marks and pointer
13 while holding the distributor Base Shaft with the proper sized wrench at the base or insulated channelocks loosen the hold down bolt and advance or ****** the distributor until the correct timing marks line up.hold in that position while assistant shuts engine off
(NOTE) when retightening the distributor bolt it can have the tendancy to turn the distributor
14 retighten the distributor bolt while holding the shaft firmly to prevent spinning
15have assistant restart engine
16 Verify that the timing marks still line up with pointer if non alignment , readjust using steps 9 thru14 again
17 once it is set correctly and bolt is tight on distributor base shut down engine. Reconnect in-line Spout Connector or reinstall inline spout shorting bar and assure that timing is advancing beyond initial settings by starting the engine and aiming at the timing marks when engine is slightly reved the timing should advance slightly 2-4 degrees maybe more depending on mileage
18 if timing can't be achieved because distriburor was removed you must
1 unhook coil wire
2 remove the #1 Sparkplug verify that the #1 piston is at the top of the compression stroke (must be on top compression stroke) if it isnt have assistant crank engine slightly to get close with coil wire unplugged. DO NOT turn the crankshaft backwards at any time to get piston into position 3 once piston is in position remove the battery cables, remove the distributor cap with wires intact and verify that the rotor cap is at center of the #1 point in the distributor cap if it isn't
4 loosen & remove the distributor bolt
5 lift the distributor only slightly enough to disengage the gear on the shaft from the camshaft gear (NOTE) when letting it back down into the engine it will spin the rotor off of the #1 position so it must be turned far enough to compensate for this turning when it is reinstalled
6 seat the distributor shaft in the hole and reinstall the retainer bolt and tighten then use the steps above to fine tune the timing

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