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Replaced plugs am wires cap an button on 84 s10 with 2.8 want crank fire in carb

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  • Cars & Trucks Master
  • 880 Answers

POPPING BACK IN THE CARB IS AN INDICATION OF WIRES CROSSED. PUT THE TIMING MARK ON THE CRANK PULLEY ON ZERO AND REMOVE NUMBER ONE PLUG. FEEL THROUGH THE HOLE IF PISTON IS AT THE TOP. ARE THE ROCKER ARMS ON BOTH VALVES ON NUMBER ONE LOOSE AND UNENGAGED(NEUTRAL). THEN REMOVE THE CAP AND OBSERVE WHICH WIRE THE ROTOR BUTTON IS POINTING TO. IT SHOULD BE POINTING TO NUMBER ONE. THEN ADD THE WIRES IN FIRING ORDER AND TRY TO CRANK AGAIN

Posted on Apr 09, 2015

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Hard start problem

I had the same problem right after installing a 45 DCOE on a stock 12A. The problem was the carburetor was not properly tuned. To tune it, refer to "Weber Carburetors", by Pat Braden, from HP Books. The main thing I had to do was adjust the idle mixture screws. Seat them lightly (screw them all the way down, but not tightly), then turn both of them out 3 and a half turns. Pull the choke and turn the key WITHOUT pumping the gas pedal. You may also need to adjust the idle speed screw, I've found that about 900 or 1000 rpms is a good idle speed for my particular aplication, but when I first started it with the Weber, I had it at 1500 rpm. It took me about a week of driving it and adjusting it to different settings to get it to run well with a reasonable idle speed. Good luck!

Posted on Nov 01, 2008

  • 6982 Answers

SOURCE: I have a 1991 Jeep Cherokee 4.0. It ran fine

spark is triggered by the crank sensor and the cam sensor inside the distributor. but the actual signal to the coil comes from the computer. If I remember correctly the hot side of the coil runs to the back of the alternator. I am sending along a complete wiring diagram for your vehicle but I suggest you get a haynes or chiltons manual for test procedures. Don't follow their wiring diagrams or you will get side tracked to death trying to figure them out (inaccurate is a mild word)
http://www.scribd.com/doc/18999822/Jeep-Wiring-2
Since I can't do the testing from here, I;m trying to give you the best possible means and chance to figure this out. Any questions just ask!!

Posted on Mar 13, 2010

  • 10 Answers

SOURCE: cant get no fire/replaced distributor

if i understand u correctly u replaced the distributor and cap if so i would start with making sure my pick up coil was installed correctlyand or replace it.i also would look at the possibility of it being a powertrain control module or neutral safety switch if this vehicle is equipt with one. hope ive been helpful

Posted on May 15, 2011

cool78259
  • 228 Answers

SOURCE: we can not figure out

You need to get an exact firing order diaghram for your make,model and engine,

call any autoparts store, and they will give you the firing order for your truck, if one

or more wires are wrong, can cause the engine to backfire or run bad. also make

sure you have the correct gap on your sparkplugs. check and set the timing,

if needed, the auto parts will also have the timing marks position. good luck!

Posted on Jul 10, 2011

archaeology
  • 662 Answers

SOURCE: Mitsubishi Diamante 2001, Car Will Not Start, Attempts to Crank, But no Fire. Blowing Engine Control Fuses repeatedly.

For the sake of completeness, here's the full no-start Troubleshooting Guide for the 2001 6 cylinder 3.5L MFI Mitsu Diamante, but the problem with your car is line item #6 - the ECC (Engine Control Computer) is shorted/dead. Without an ECC, the Diamante will (a) get no spark, since the ignition timing comes from the computer, and (b) get no fuel, since the fuel injectors are operated by the computer as well. The engine will turn over, since running the starter motor is a non-computer controlled matter of a correctly functioning ignition switch, a charged battery, and good wiring to a functional starter motor/solenoid, but will never start.
The clue pointing directly to the ECC failure is the blowing ECC fuses. These fuses are blowing to tell you that the ECC is shorted dead.
Since the ECC is expensive, exhaustively check out all other possible sources of the problems, but with so few problems causing loww of both spark and fuel, combined with the blown ECC fuses pointing directly to the ECC, it seems that the ECC is the only culprit.
Here's a used 2001 Mitsu Diamante ECC at Ebay for $175.

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=270828804340+&item=270828804340&lgeo=1&vectorid=229466


Priority Action Part Type Cause
1 Inspect Choke - Stuck or Improperly Functioning Choke.
2 Inspect Fuel Filter - Clogged or Dirty Fuel Filter.
3 Inspect Fuel Pump Relay - Faulty Fuel Pump Relay.
4 Inspect Fuel Injector Pressure Regulator - Faulty Fuel Injector Pressure Regulator.
5 Inspect Fuel Pump - Low Fuel Pressure.
6 Inspect Engine Control Computer - Incorrect Operating Information Being Delivered and Sent From The EEC.
7 Inspect Fuel Pump Strainer - Clogged or Dirty Fuel Pump Strainer.
8 Inspect Ignition Switch - Improperly Connected or Faulty Ignition Switch.
9 Inspect Battery - Battery Discharged or Faulty.
10 Inspect Battery Cable - Coroded, Broken, Shorted or Poorly Connected Battery Cable.
11 Inspect Solenoid - Starter Solenoid Faulty.
12 Inspect Starter - Starter Motor Faulty.
13 Inspect Wireset - Worn or Damaged Spark Plug Wires.
14 Inspect Ignition Coil - Faulty Ignition Coil.
15 Inspect Distributor Cap - Loose, Cracked or Worn Distributor Cap.
16 Inspect Spark Plugs - Incorrectly Gapped or Fouled Spark Plug(s).
17 Inspect Distributor Rotor - Loose, Cracked or Worn Distributor Rotor.
18 Inspect Fuel Tank - Fuel Tank Empty.
19 Inspect Carburetor - Worn, Faulty or Damaged Carburetor.

The fuel pump strainer is a sock-like strainer in the fuel tank on the input side of the fuel pump designed to protect the fuel pump by straining out any debris in the tank (similar to the way that the fuel filter protects the engine/fuel injectors/fuel pressure regulator).

Posted on Nov 27, 2011

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Have a 73-74 366 that has a aftermarket carter afb carb and it is popping through the carb while cranking and will not stay running. Have done a compression test-normal, changed cap and coil, checked...


Usually there are three reasons for backfiring thru the carb.
Not enough fuel, spark timing too early, or an open intake valve.
If the compression is good on all cylinders as you stated, my guess would be spark timing or mixture too lean. Could be a large vac leak somewhere too.
You say you checked the ignition, but do you know for a fact the plugs are all firing at the right time ? You could pull each plug wire and check each cylinder one at a time. Did you change the rotor when you changed the cap, and is there any chance the wires are cross-firing ?

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1985 Chevy El Camino 305ci. Turned over good but wouldn't fire. Replaced contrrol module and it started fine for about 2 months, then did the same thing. Replaced dist cap, rotor & coil. Start


Had an 84 silverado 305 that did the same thing. Try giving it a full tune up. Plugs, wires... Mine turned out to be fouled plugs. I didn't find that out till after i tore it down & put a timing set in it. Wasn't getting good enough spark.

Feb 16, 2013 | Cars & Trucks

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I replaced cap rotar and dist. now it cranks over but will not fire and is back firing


the timing is off a bit! heres how I do it. remove the number 1 plug, stick a straw or similar in plug hole. turn engine over by the crank shaft with a wrench. when piston gets to very top of bore, just before it goes down. this is tdc. remove distributor cap and remove distributor reposition the distributor rotor button facing number 1 plug wire inside cap. replace cap and try it! please let me know if this works for you. good-day ! if you can not get to number 1 plug. just turn the crank to tdc marks are on damper pully or crank. is this a 5.7,

Apr 08, 2012 | 1997 GMC Yukon

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When i give it full throttle it backfires through the throttlebody? already replaced plugs, wires, cap and rotor, idle air valve. cant find crank positioning sensor to set timing.


When you state you have a "Cap & Rotor", indicating an engine, which may possibly be OLDER than the 1994 S-10 it is in. A Crank positioning sensor, on a full throttle body, (or do you mean carburetor/combo/injector system) Not the true name, but, in appearance, looks like a carb. It has a "pulsating" injector within the opening of the butterfly/mouth of the throttling body. When you have an ECM, or Computer Command timing, with a crank sensor, you will have 2 coil packs for 4 cylinder, a 3 coil pack for a V-6. They will be just under the electric cooling fan for the radiator. If you are driving a "bought used" vehicle, and the Cap, Rotor, & wires are only accessed thru the RH wheel well, it is a "Distributor System" & an OLDER engine. The Back fire is being caused by a "jumped" timing belt, or HOPEFULLY, a crossed spark plug wire.

Aug 31, 2011 | 1994 Chevrolet S-10

1 Answer

My 84 ranger completely shuts down while I'm driving it at random times. I've put on new ignition module, ignition coil, 2 different new fuel pumps, new wires and plugs. Used carb,. used distributor with...


Silly suggestion i know from a professional mechanic but try leaving the fuel cap loose in case its not drawing air into the tank and its creating a vacumn in the tank which means that the fuel pump cannot draw fuel up .Try that for a day or so and if it doesnt work then keep this post on your Email and get back to me .The clue is the petrol in the carb intake and if iam right drill a small vent hole in teh filler cap

Feb 03, 2011 | 1984 Ford Ranger

1 Answer

Exact spark plug wire placement


Turn the crankshaft till the timing mark is at 0...Check where the rotor points...if towards the back of the engine, turn one more time till it points to front. It is now at #1 on cap. Plugs are 1357 on left bank, 2468 on right. order is 18436572 in that order around cap in the direction the rotor turns when cranking.

May 30, 2009 | 1984 Dodge Caravan

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Not starting


your cam to crank timing is wrong...recheck it.  Or your spark plug wires are in the wrong places

Mar 27, 2009 | 1993 GMC Jimmy

1 Answer

Truck will crank and then shut off


You will need to do your testing while the vehicle is in failure to start mode.Check wether the coil is recieving 12v and pour a little fuel down carb to see if it wants to run.If pouring a little fuel down carb makes the car try to fire up you probably have a fuel pump issue.If it doesnt try to fire you have an ignition problem.Hope you get it sorted and good luck.

Dec 20, 2008 | 1984 Ford F 150

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1992 Firebird not starting


If it is backfiring the firing order is not correct. turn the crank until the timing mark lines up to zero on the timing cover. Remove the distributor cap, and see where the rotor button is pointed. It should be pointed at number 1. (at this point you have a 50/50 chance) The cam turns half the speed of the crank shaft, this means that even through cylinder number one is at top dead center, it might be on the exhaust stroke instead of compression stroke. If this is the case, you will need to turn the crank shaft one full revolution, and try again.

Reinstall the distributor cap with plug wire number one being placed where the rotor button is pointed. Install the rest of the plug wires in order.

Jul 16, 2008 | 1992 Pontiac Firebird

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