stuttering/shaking problem - Page 2

Chris Stewart · #16 07-23-2005, 04:30 PM

I had a bad one on the '92 and it didn't even look crappy.
I put together a set of Accel spiral core wires to last me to the other side of Social Security.

nockam · #17 07-23-2005, 08:52 PM

I would just take it to a shop, dish out 40 bucks and have them find out what is wrong, then you do the work yourself.

ericn1300 · #18 07-24-2005, 12:30 AM

after all the work you've done, changing the plug wires is cheap and easy. even if it doesn't fix the problem you have one less thing to worry about down the road.

yes a fuel pump can go slowley bad, getting weaker as time goes on, or just getting weaker as it warms up sometimes. chris mentiond in one of his earlier post that there is a test point for fuel pressure. did you change the fuel filter yet? if you can't get it off just take it to the quick lube and tell them to change it along with your oil change, and ask to see the old one when their done. then it's their problem. they do it for a low flat rate.

the only other thing i can think of is a vaccum leak. did you check all your vaccum hoses for cracks or disconects?

badluckbravada · #19 07-24-2005, 01:28 AM

yea the fuel filter is changed still no difference

badluckbravada · #20 07-24-2005, 03:07 PM

can a shop check for vaccuum leaks?

derhells · #21 07-24-2005, 09:09 PM

If you were having a rough idle the first thing you should have gone after would have been the plugs wires cap and rotor. Always start with the cheapest and most obvious places. I did have a fuel pump going slowly but it equaled a no start every now and then and slowly got worse but had nothing to do with a rough idle. I bet the wires will solve you rproblem. I had a rough idle only after the truck was running for about ten minutes turns out one of my wires was against the manifold and when the engine warmed up it was causing the rubber to expand and was grounding a wire to the manifold.

Chris Stewart · #22 07-25-2005, 04:50 AM

Quote:

Originally Posted by nockam

I would just take it to a shop, dish out 40 bucks and have them find out what is wrong, then you do the work yourself.

There's so much truth in that. If only you could be certain that they're that certain what the problem is.
I don't give myself good warranties either

jp218 · #23 04-04-2006, 01:18 AM

I am having this same problem on my 94 Olds Bravada. I am just wondering if the plugs and the wires fixed the problem. My car runs a little low on the idle and then for the first 50 ft of driving it runs crappy but once it shifts to 2nd gear it runs better until about 50-55 miles per hour and then i get the stuttering and shaking problem. So we are in the same battle and i am dying to know if the plugs and wires actually fixed it. Thanks

Chris Stewart · #24 04-04-2006, 08:49 AM

Does your Bravada have a Check Engine light on?
I think the '94 is OBDII so it'll have to be scanned if the Check Engine light is on.

dkunio · #25 04-04-2006, 11:14 AM

Me too! At start up, blows carbon. Past experiences indicates ERG. Found code 45 is set but I haven't had a chance to look it up yet. I also had a problem with injector. I turned the screw in the center of the pressure regulator all the way in then back out 2 full turns. It wasn't wise for me to mess with it in the first place but I was frustrater with stalling problem.

AnybodY know how to correct the fuel pressure regulator setting? I have gotten quick at removing the mainifold. I am thinking of turning the screw in at 1/8 increments and test driving.

dkunio · #26 04-04-2006, 04:10 PM

Code 45 turned out to be "reading rich". Oh well, back to the fuel pressure regulator

ericn1300 · #27 04-04-2006, 06:42 PM

Quote:

Originally Posted by dkunio

Code 45 turned out to be "reading rich". Oh well, back to the fuel pressure regulator

my 92 set a code 45 when trying to drive thru a cold start misfire. the engine was running rough cold and i hoped it would clear up as it warmed up because i needed to get to work. raw fuel being pumped thru by a misfiring cylinder caused it. i suspected an ignition problem right away and after going thru the plugs and wires it turned out to be a shot distributor but didn't find it until after being ripped off by the shop i took it to who ignored my description and chased a fuel system problem based on the code instead.

read these two threads for more information:
http://www.automotiveforums.com/vbul...d.php?t=514233
http://www.automotiveforums.com/vbul...d.php?t=518453

dkunio · #28 04-04-2006, 06:44 PM

Code 45 turned out to be "reading rich". Oh well, back to the fuel pressure regulator

derhells · #29 04-04-2006, 08:39 PM

My wires did solve the problem sorry if this is a late response I am now driving a jeep and have not been to the board in a while!!

Chris Stewart · #30 04-04-2006, 09:17 PM

Quote:

Originally Posted by dkunio

Code 45 turned out to be "reading rich". Oh well, back to the fuel pressure regulator

Since you have the intake plenum open, what does the area next to the regulator side of the CPI look like? Do you see any areas in the plenum clean and wet with gasoline? That is evidence that the diaphram of the regulator has a hole in it and could end up damaging the engine.

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