Question about 1991 GMC S-15 Jimmy

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What to set timing using timming light

I have a 1991 gmc jimmy s15 4.3 engine, i replaced timing chain, i need to know what to set timing with a timing light, the information under hood is missing.

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0 degrees BTDC would be the spec , there is a brown w/tan tracer wire near the distributor , you have to disconnect the connector before setting timing

Posted on Feb 06, 2009


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1 Answer

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

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Timing chain replacement 1991 jimmy s-15

radiator should be drained but if you can't find petcock remove lower hose at the radiator. There is a bracket on top with around 5 to 8 screws. Then lift off bracket. Take the upper hose loose at the radiator to let the rest of the coolant out. the overflow reservoir has a small clamp to remove as well. If this is an automatic with coolant lines take them off from the bottom. Sometimes they are rusty so do small part turns to break loose. You don 't want to replace these
because they are hard to get at. A catch bin of 2 gallons should be enough to catch the coolant. It is poison but dogs and cats like the sweet taste. During reassembly keep in mind that there are rubber mounts on most of these usually 4 used as a shock mount.

Jan 24, 2013 | 1991 GMC S-15 Jimmy

2 Answers

I have a 2001 GMC Jimmy and the motor is rattling whenever I excelerate. It has 116,000 miles on it and I have the oil changed every 3000 miles. What could be wrong?

Thanks for choosing FixYa. You may have an issue with your motor mounts or the suspension on your Jimmy, thus causing the engine to rattle. If it is only doing this during acceleration, it could be a few different things. Since you have 116,000 miles, you are in need of a tune up, if you haven't already. You may need to change your fuel filter or injectors. If the engine is not getting enough gas to the engine, it can cause the engine to miss, causing noises. You will need to check the fuel pressure to determine that though. As far as the tune up, you may need new spark plugs/coils, and wires. There may be internal engine damage but I think it is something simple. If your check engine light is on, you could take it to Autozone and have it scanned. They do it for free and they can tell you why the light is on. This is the best path because you are not guessing what it is. If no light is on, and you haven't changed any of these parts, I would start there. If you have any other questions, just let me know. Thanks for using FixYa and have a great day.

Mar 29, 2011 | 2001 GMC Jimmy

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I own a 1999 GMC Jimmy that i recently had new plugs wires dist cap rotor camshaft sensor and crankshaft sensor.It seems the service engine soon light came on.When put on a diagnostic machine its telling...

The machine it talking about code P1345 CKP/CMP sensor correlition Do the engines RPMS fluctuate at idle or if you try to hold it at a steady speed if so then check the connection at the CKP make sure it is getting voltage its installed correctly and so on. If no problems are found then you need to check the distributor shaft remove the cap and see if the rotor turns on the dist shaft if it dose then thats the problem and eigther must be replaced or rebuilt thats the distributor it self

Jan 14, 2011 | 1998 GMC Jimmy

1 Answer

The time jumped or something like that so how do you replace a timing chain in a 1993 gmc jimmy?? neeed help please

If you have no knowledge of engines and replacing a timing chain,find a good repair shop

You won't have all the tools necessary to do the job yourself

Nov 07, 2010 | 1993 GMC Jimmy

1 Answer

Hi i just rebuilt moter in a 1995 gmc jimmy with a 4.3L vortec v-6. having trouble setting the timeing.any info would be great


Feb 02, 2010 | 1995 GMC Jimmy

1 Answer

Timing specs

Connector is under right side dash under heater box. It may be tucked under carpet. Wire is tan w/ black stripe. Base timing is 0 TDC with engine warm and connector unplugged.

Feb 07, 2009 | 1991 GMC S-15 Jimmy

2 Answers


Check the fuel pump.

Jan 09, 2009 | 1991 GMC S-15 Jimmy

1 Answer


On your engine, you will need to removed the first spark plug on the drivers side of the engine. (if you are looking at the engine from the front, it will be your right side) Next, have someone "bump" the key as if you were trying to start the engine while holding your finger over the spark plug hole. When air is forced out of the spark plug hole, stop and check the crank shaft balancer for a small groove. It should be lined up the the make on the front of the engine. That will have you a tdc and you always use the number one cylinder to set the timing on you truck. If you need more assistance let me know.

Dec 28, 2008 | 1991 GMC S-15 Jimmy

2 Answers

1995 gmc Jimmy

maybe bad ignition module or coil.. when they get hot sometimes they wanna die...

Sep 16, 2008 | 1995 GMC Jimmy

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