Question about 1996 GMC Sierra

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Engine won't start

We've replaced timing gear, distributor internals, starting/charging system, rebuilt the carburetor, and replaced plugs and wires. we know fuel is reaching the carburetor, and we know there is spark to the plugs. compression test has been done and everythings good, but the engine still won't fire. it was running but kept loosing charge so charging system and starter was replaced. while doing this, the distributor was pulled out to put in a new sending unit for oil pressure, and the engine hasn't started since. its a 305 Chevy V8 1977 with Electronic ignition in a 1978 gmc pickup

PLEASE PLEASE PLEASE help

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When you pulled the dist did you mark it before pulling it and were ALL the timing marks lined up
if not you will need to pull # 1 sparkplug and get the piston up to TDC (top dead center) on the compression stroke then put the dist back in with the rotor pointing to # 1 plug wire .
Be sure to check dist direction of rotation and comfirm firing order

Posted on Feb 27, 2009

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Even if you have spark, it may not be "good spark"

Try cleaning the contacts to the coil, or replace the coil itself.

May have pinched or cut a wire by mistake during the work you have done. Check all for proper grounding as well

Posted on Feb 27, 2009

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1 Answer

Chevy timing


cam or spark? timing?

my wild guess, is spark.

its in the FSM book

at at alldata.com , every day, 24/7

7.4 L liters.

there are 2 systems used, in 97

DIS (no distributor) DIS means, (distributor-less, Ignition systems)

or

Dizzy engines. with Distrib.

what is yours, the DIS has no timing, its FIXED.



here are the steps on Dizzy

course is first , HV wires set to correct firing order

1-8-4-3-6-5-7



  1. Remove the No. 1 cylinder spark plug.


  2. Turn the engine using a socket wrench on the large bolt on the front of the crankshaft pulley. Place a finger near the No. 1 spark plug hole and turn the crankshaft until the piston reaches Top Dead Center (TDC). As the engine approaches TDC, you will feel air being expelled by the No. 1 cylinder. If the position is not being met, turn the engine another full turn (360 degree). Once the engine\'s position is correct, install the spark plug.


  3. Align the pre-drilled indent hole in the distributor driven gear with the white painted alignment line on the lower portion of the shaft housing.


  4. Using a long screwdriver, align the oil pump drive shaft in the engine in the mating drive tab in the distributor.


  5. Install the distributor in the engine.


  6. When the distributor is fully seated, the rotor segment should be aligned with the pointer cast in the distributor base. The pointer will have a "6" or "8" cast into it indicating a 6 or 8-cylinder engine. If the rotor segment is not within a few degrees of the pointer, the distributor gear may be off a tooth or more. If this is the case repeat the process until the rotor aligns with the pointer.


  7. Install the cap and fasten the mounting screws.


  8. Install the hold-down clamp and bolt, then tighten the bolt to 20 ft. lbs. (27 Nm).


  9. Engage the electrical connections and the spark plug wires.




fine tuning with timing light is next.


HEI Systems


  1. Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. You can also use the No. 6 wire, if it is more convenient. Numbering is illustrated in this section.


Do not pierce the plug wire insulation with HEI; it will cause a miss. The best method is an inductive pickup timing light.



  1. Clean off the timing marks and mark the pulley or damper notch and timing scale with white chalk.


  2. Disconnect and plug the vacuum line at the distributor on models with a carburetor. This is done to prevent any distributor vacuum advance. On fuel injected models, disengage the timing connector which comes out of the harness conduit next to the distributor, this will put the system in the bypass mode. Check the under hood emission sticker for any other hoses or wires which may need to be disconnected.


  3. Start the engine and adjust the idle speed to that specified on the Underhood Emissions label. With automatic transmission, set the specified idle speed in Park. It will be too high, since it is normally (in most cases) adjusted in Drive. You can disconnect the idle solenoid, if any, to get the speed down. Otherwise, adjust the idle speed screw.


The tachometer connects to the TACH terminal on the distributor and to a ground on models with a carburetor. On models with fuel injection, the tachometer connects to the TACH terminal on the ignition coil. Some tachometers must connect to the TACH terminal and to the positive battery terminal. Some tachometers won\'t work with HEI.

4:



  1. Aim the timing light at the pointer marks. Be careful not to touch the fan, because it may appear to be standing still. If the pulley or damper notch isn\'t aligned with the proper timing mark (see the Underhood Emissions label), the timing will have to be adjusted.


TDC or Top Dead Center corresponds to 0degB, or BTDC, or Before Top Dead Center may be shown as BEFORE. A, or ATDC, or After Top Dead Center may be shown as AFTER.



  1. Loosen the distributor base clamp locknut. You can buy trick wrenches which make this task a lot easier.


  2. Turn the distributor slowly to adjust the timing, holding it by the body and not the cap. Turn the distributor in the direction of rotor rotation to retard, and against the direction of rotation to advance.


  3. Tighten the locknut. Check the timing again, in case the distributor moved slightly as you tightened it.


  4. Reinstall the distributor vacuum line or the timing connector. Correct the idle speed.


  5. Stop the engine and disconnect the timing light.




end,



DIS or not DIS< the question???????????????????????

Jul 03, 2014 | 1997 Chevrolet C3500

1 Answer

Ny 1989 chevy blazer S-10 V6 2WD won't st,art,


I don't think 3 months makes stale gas, maybe year old gas, but not your short time. And if not mistaken, I think you have throttle body injection on an '89 chevy, although chevy always was a little behind the curve on new improvements to cars. hint, hint.
The computer has everything to do with it. it controls ignition timing, it controls spark, it controls the fuel pump and the injectors. Since it won't start with starter fluid or gas, next step is to look into the ignition system. Check for spark on a couple of spark plug wires. If you have a blue, snapping spark, you can assume your ignition system is working well enough to start the engine. Take a spare spark plug or pull one of your plugs from engine, attach the plug wire onto it, and lay the plug on a metal piece of the top of engine-the spark plug hex and threads is the natural ground for the plug, so if you lay the threads on a metal piece, or hold it tight against a steel bolt, you can observe the spark jumping the gap, and no danger of getting shocked. But if you hold it, just in case, wear a glove or wrap a heavy cloth or rag around the wire. Remember, a blue energetic spark has to be seen to verify good ignition. Oh yes, you need a helper to crank the engine over while you watch for spark. If no spark, and you have a distributor, check the coil wires output at the end that connects to center top of distributor.Pull it from distributor and hold the metal end terminal no more than 1/4 inch from a ground source, a bolt or the frame, or an engine bracket. Helper has to crank the engine over, and watch for good blue spark. If no spark there-ignition: coil, crank position sensor (or maybe a pickup coil inside your distributor-same function), ignition control module, computer, and all the associated wiring.
If coil has spark, but none at plug wire ends, inspect closely the distributor cap and rotor. not passing current or shorting out there.
So the basics are, to run, the engine needs gas, air, compression, and a timely spark.

May 06, 2013 | Cars & Trucks

1 Answer

1999 nissan altima won't start,no spark in distributor to the spark plugs..is it because of the security system? Don't have the remote for it..


1. Ignition Switch: Improperly Connected or Faulty Ignition Switch.
2. Battery: Battery Discharged or Faulty or Coroded, Broken, Shorted or Poorly Connected Battery Cable.
3. Solenoid Switch: Starter Solenoid Switch Faulty.
4. Starter Starter Motor Faulty.
5. Wireset: Worn or Damaged Spark Plug Wires.
6. Coil -Ignition-: Faulty Ignition Coil.
7. Distributor Cap: Loose, Cracked or Worn Distributor Cap.
8. Spark Plug: Incorrectly Gapped or Fouled Spark Plug(s).
9. Distributor Cap and Rotor Kit: Loose, Cracked or Worn Distributor Cap.
10. Carburetor: Worn, Faulty or Damaged Carburetor.
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Sep 06, 2012 | 1998 Toyota RAV4

9 Answers

What would make my 1999 Chevy Blazer 4x4 with a 4.3L Vortec engine suddenly start backfiring?


I know there are a lot of solutions here but I would concentrate on a couple of known issues for the 99 4.3l engine. Remove the distributor cap and rotor, check the reluctor wheel under the rotor and make sure it is not loose on the distributor shaft. The other issue is a worn distributor gear, you will notice a lot of freeplay when you try rotating the distributor rotor back and forth.
Last but not least, spray the inside of the distributor cap, the rotor and the inside of the distributor, this will remove and prevent moisture build up causing the backfire issue you are experiencing...
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Lately, whenever it rains, my 1998 chevy blazer wont start/won't run. the engine turns over, but it won't run. after 2 or 3 days it will fire up like nothing was wrong with it to begin with. any...


Whenever I had this problem, it was always cured with a new set of GOOD spark plug wires. Not generic set off the parts store shelf. Get some moisture removal spray and put it on both ends, the coil and the plug, before putting the wires on. Do one wire at a time so you do not get them mixed up. I do not think you have a distributor or a cap. If you do replace it also as it is over 20 years old.

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