Question about 1998 GMC Jimmy

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1998 GMC JIMMY 4.3 LITER VORTEC WILL NOT REV OVER 2000 RPM ,CHANGED DISTRIBUTOR , TIMING CHAIN,SPIDER, FUEL PUMP,COMPUTOR DOES NOT RECOGNISE MAS AIR FLOW SENSOR , CHANGED AIR SENSOR , RAN WIRE FROM AIR FLOW SENSOR TO COMPUTOR NO CHANGE

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6ya6ya
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Posted on Jan 02, 2017

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hasbensystem
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SOURCE: fuel pressure regulator

How do you know that it is the regulator?
these 4.3 motors had a lot of trouble from 93 to 98, I know I had 2 of them.
What happened to mine was that the intake kept getting very carboned up. After I would clean it, the truck would run fine for about 5 or 6 months, then same thing.
Theres actually a class action lawsuit about this that I believe has been settled, you may have recourse if you bought it through a dealer. Good luck.You'll need it.

Posted on Dec 23, 2008

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SOURCE: need location of fuel pump relay on 98 gmc jimmy

In the Underhood Bussed Electrical Center

Posted on Jun 24, 2009

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SOURCE: 93 gmc jimmy 4.3 vortec has a flooding problem. I

The most likely 2 causes are leaking fuel pressure regulator on the side of the spider, or leaking fuel LINE going into or out of the spider. Both are reasonably common failures. a replacement spider would come with a new regulator but NOT a new line, so verify which is leaking before you order a spider up.

They do not fail that often anymore, not like 5 or 8 years ago when gasoline still had mtbe in it, the vortec unit is very dependable nowadays.

Posted on Sep 16, 2009

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SOURCE: What type of antifreeze do I use in a 4.3 liter

dextron its pink or orange for gm cars

Posted on Oct 05, 2009

Mechanic65
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SOURCE: need firing order and distributor

1-6-5-4-3-2
number 1 is the front Cyl on drivers side.
then it is #3 #5
Passenger side is #2 #4 #6
#1 on distributor cap is the front side of cap next
to the hold down screw clockwise side of the screw.
Firing order goes clockwise looking down on the distribuater.

Posted on Sep 12, 2010

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3 Answers

I have a 1997 GMC Jimmy 4.3 liter V6 4 wheel drive why would it lose power and want to stall when I put it in gear


The first thing you need to do is have the engine computer control module scanned for fault codes. Autozone and O'reilly auto parts do this for free. Ask for a OBD2 fault code test.

Apr 08, 2017 | 1997 GMC Jimmy

1 Answer

I have a 1998 GMC Jimmy. It died while driving today. Had it towed home. It will not start. Have good fuel pressure and spark is yellowish. replaced coil and ignition module. Also swapped out ecm. tried...


I have replaced countless distributprs for this issue. also fuel pressure has to be abovr 50 psi or will not start needs 50 pdi to open poppit valves on injectors. also if the spiders ruptured will be to much fuel and won't start hook up fuel gauge turn key on till reaches max psi turn the key off shouldn't loose more tham 15-20 psi if it does suspect spiders leaking.

Oct 30, 2013 | 1998 GMC Jimmy

2 Answers

My 94 GMC Jimmy 4x4 vortec, is hard to start, cuts off when i make stops, have to put it in neutral when i am at lights and still have to give it gas then. already changed the distributor cap and rotor...


I recently had similar symptoms from my Kia Rio, hard to start, bad idle in gear, etc.
Ended up being the idle air control valve, you can try cleaning yours with carb cleaner and see if there's any difference.
A clogged fuel filter can produce the same symptoms too, that might be the easiest thing to start with, then it's just a process of elimination from there.

Sep 02, 2011 | 1994 GMC Jimmy

1 Answer

1998 gmc jimmy,about a month ago,I changed plugs wires cap and rotor and now it is runnniun ruff,mising out on acceleration shakes @ 2000 rpm.ran good for a month.


If a random multiple misfire code appears , and electrical system checks out Ok, need to do a fuel pressure test at the fuel rail (Drivers side) if checks out ok, it very well can be sticky fuel injectors.If injectors leak by can cause to much fuel dispursed into engine, sometimes a bottle of lucas fuel injector cleaner will do the trick, opens up the poppets (injectors) although the (Spider Injector) has an electrical pulse that is supplied from the ECM (computer.) The spider injectors definitely go bad some sooner than others! Not a pleasant job also an expensive job if u are not doing it yourself! If your vehicle was fine before this started happening go back over everthing u have done, check each wire out with a noid to see if spark is correct ( A noid plugs into end of the wire that goes onto the sparkplug, check each wire one at a time, u can purchase a noid for this vehicle at your local autoparts store) Not saying this is definitely the problem, there are many things that cause these problems,crank sensor, cam sensor, tps mass air flow map sensor intake leaks and vacuum leaks etc etc,u can check for leaks by spraying down intake and vacuum lines with a can of carb cleaner, look for a change in the idle when u are spraying it down How do we know? been thru it all to often! GOOD LUCK! 1998 GMC Jimmy 4.3 Liter Vortec V- 6.

May 05, 2011 | 1998 GMC Jimmy

2 Answers

97 GMC Safari w/ 4.3(W) V6 vortec. 195k miles. Engine is running very rich. 10mpg. Smell of gas sometimes coming from exhaust when running. It has rough idle, and dies, especially when cold. Lacks power,...


your injector spider it look like a spider under the planium its the injector pipe that are broken if you check everything else that it you need to remove the planium you will see that injector module be carefull loosy plastic clip holding those injector in they break easy let me no and thanks for using fixya

Mar 01, 2011 | GMC Safari Cars & Trucks

1 Answer

I have a 1992 GMC Jimmy CPI. well it dumps alot of fuel and runs like **** from idle till about 2500 rpm. there is always gas in the oil after a while also. ive given it a tune up and everything. it has to...


Is this the Vortec engine? If so, the fuel injector spider, has a built in pressure regulator and i would say it is spraying way too much fuel into the cylinders. At the same time is is washing your cylinders of lubrication, and that itself is not good.

Feb 01, 2010 | 1992 GMC Jimmy

1 Answer

I have 1998 sierra 1500 vortec 5.0 liters,when engine is cold (below 35 degre f )engine turn but don t start,i have fire,fuel pump run and i have pressure on my main fuel line juste before injector pack...


Camshaft To Crankshaft Position Correlation Fault is what p1345 means. if the problem isnt electrical I would imagine the timing chain could be stretched and the engine is out of time somehow

Nov 18, 2009 | 1998 GMC Sierra

1 Answer

How to replace spider regulator on a 1999 gmc jimmy


This fuel pressure regulator is a component part of the SFI (sequential fuel injection) assembly, sometimes referred to as "spider". It resides inside of the air intake plenum and is accessed by removing the upper half of the intake. 
Good luck and hope this helps. 
Most of the time when your having problems, it's most likely going to be the whole spider unit. GM has been know to have problems with this type of fuel injection system. 
Check the vacum line to the fuel pressure regulator at the back of the spider housing by the high pressure fuel line. You can see it just in front of the distributor cap and spider assembly.

Apr 23, 2009 | 1999 GMC Jimmy

1 Answer

Will not start.


The "spider" up under the plastic intake plenm, the poppets athe end of each of the plastic tubes that supply the fuel to the cylinders get carbon on them and cant spray fuel. to buy a new one at GM its $550.00 Gm is the oly place you should look for one no matter the price aftermarket "copies" are not the same and while you are in there change the fuel prssure regulator at the sam time they are bot a big problem with the vortec
Change the fuel filte also and then EVERY EVERY 15,000 mles and don't worry about the engine oil change that once every 4 or 5 years that is not nearly as important as the fuel filter nothing will happen just remember the fuel filter and forget oil changes don't worry about all that 3000 mile stuff.

Sep 01, 2008 | 1985 GMC Jimmy

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