1990 silverado ruff idle

bigchevyman · 09-23-2007, 02:20 PM

Hi. i have a 1990 silverado. it has a small block 350 with TBi and my starter went out and so i was changing it and i forgot to unplug the battery and a big spark came off the starter so then i unpluged it forgot i know stupied any ways so after i got it fixed it hasnt been tyhe same when it is cold idle really ruff from like 1500 to 500 all in that range but when it gets warm it idles fine but still langs when i give it gas and feels like i have lost like 30 to 50 hp slow as dirt if any one has any anwsers plz email me at yamahariderrp[at]yahoo.com

**qldit** · 09-24-2007, 02:26 AM

Good Evening bigchevyman, actually an arcing battery lead should not really have affected anything because the system would have been unpowered.

I would suggest dosing the tank with injector cleaner and filling it with premuim unleaded fuel and seeing if that had any effect after a week or so.

By the way it might be an idea to edit your email address from your post or request one of the admins to do it for you, you may otherwise get a load of unsolicited rubbish.

Cheers, qldit.

bigchevyman · 09-27-2007, 06:29 PM

hi i did waht u asked its still doing the same thing it stalls when it is could at idle idk whats wrong

**qldit** · 09-27-2007, 08:48 PM

Good Morning bigchevyman, actually that problem could be caused by a number of things, leaky or sticky injectors, egr valve leaking, an ignition problem, vacuum system leakage or some other sensor that is not operating properly.

I would suggest at this point to access and read the computer codes and see if they might give a clue to the problem.

For such a difference in power loss there should be something quite evident.

Is there any possibility that arc that happened may have involved the O2 sensor on the exhaust manifold?

Others will have different ideas.

Cheers, qldit.

**qldit** · 09-27-2007, 08:52 PM

Quote:

Originally Posted by qldit

Good Morning bigchevyman, actually that problem could be caused by a number of things, leaky or sticky injectors, egr valve leaking, an ignition problem, vacuum system leakage, low fuel pressure or some other sensor that is not operating properly.

I would suggest at this point to access and read the computer codes and see if they might give a clue to the problem.

For such a difference in power loss there should be something quite evident.

Is there any possibility that arc that happened may have involved the O2 sensor on the exhaust manifold?

Others will have different ideas.

Cheers, qldit.

bigchevyman · 09-29-2007, 02:34 PM

ok well i am getting plunty of fuel it just seems like spark may bee a problem do you yhink a distrubitor can make it run like crap like that and loose that much power

**qldit** · 09-29-2007, 11:58 PM

Good Afternoon bigchevyman, yes, the ignition timing may have shifted, if the distributor may have moved, but you will need the timing procedure for that vehicle and a timing light to reset it properly.

One of the Haynes manuals would be very handy to give that information.

I am not familiar with that vehicle, quite obviously it is fuel injected but obviously it has a distributor.

Ensure the vacuum system has no leaks anywhere before getting too involved.

If the spark-plug leads are original it may be an idea to replace them they do deteriorate significantly over time and can cause odd problems like this also.

Change the spark plugs while you are at it.

Carefully inspect the distributor cap for any signs of arcing and condition, do a complete visual inspection of all those ignition components.

It doesn't take much to knock the guts out of those engines.

Cheers, qldit.

Spacemonkey6401 · 10-02-2007, 10:03 PM

Does the fuel spray in a fine mist, or does it drop in?

Check all of the vacuum lines as stated above.

If not EGR might be the problem.

09-23-2007, 02:20 PM	#1 (permalink)
bigchevyman Registered User Join Date: Sep 2007 Posts: 3 OS: vista	1990 silverado ruff idle Hi. i have a 1990 silverado. it has a small block 350 with TBi and my starter went out and so i was changing it and i forgot to unplug the battery and a big spark came off the starter so then i unpluged it forgot i know stupied any ways so after i got it fixed it hasnt been tyhe same when it is cold idle really ruff from like 1500 to 500 all in that range but when it gets warm it idles fine but still langs when i give it gas and feels like i have lost like 30 to 50 hp slow as dirt if any one has any anwsers plz email me at yamahariderrp[at]yahoo.com Last edited by Midnight Tech; 09-23-2007 at 08:21 PM. Reason: Edited email to stop email harvesting spammers

09-24-2007, 02:26 AM	#2 (permalink)
qldit TSF Gearhead Join Date: Mar 2007 Location: Brisbane Australia. Posts: 592 OS: All Systems, mainly Linux	Re: 1990 silverado ruff idle Good Evening bigchevyman, actually an arcing battery lead should not really have affected anything because the system would have been unpowered. I would suggest dosing the tank with injector cleaner and filling it with premuim unleaded fuel and seeing if that had any effect after a week or so. By the way it might be an idea to edit your email address from your post or request one of the admins to do it for you, you may otherwise get a load of unsolicited rubbish. Cheers, qldit.

09-27-2007, 06:29 PM	#3 (permalink)
bigchevyman Registered User Join Date: Sep 2007 Posts: 3 OS: vista	Re: 1990 silverado ruff idle hi i did waht u asked its still doing the same thing it stalls when it is could at idle idk whats wrong

09-27-2007, 08:48 PM	#4 (permalink)
qldit TSF Gearhead Join Date: Mar 2007 Location: Brisbane Australia. Posts: 592 OS: All Systems, mainly Linux	Re: 1990 silverado ruff idle Good Morning bigchevyman, actually that problem could be caused by a number of things, leaky or sticky injectors, egr valve leaking, an ignition problem, vacuum system leakage or some other sensor that is not operating properly. I would suggest at this point to access and read the computer codes and see if they might give a clue to the problem. For such a difference in power loss there should be something quite evident. Is there any possibility that arc that happened may have involved the O2 sensor on the exhaust manifold? Others will have different ideas. Cheers, qldit.

09-29-2007, 02:34 PM	#6 (permalink)
bigchevyman Registered User Join Date: Sep 2007 Posts: 3 OS: vista	Re: 1990 silverado ruff idle ok well i am getting plunty of fuel it just seems like spark may bee a problem do you yhink a distrubitor can make it run like crap like that and loose that much power

09-29-2007, 11:58 PM	#7 (permalink)
qldit TSF Gearhead Join Date: Mar 2007 Location: Brisbane Australia. Posts: 592 OS: All Systems, mainly Linux	Re: 1990 silverado ruff idle Good Afternoon bigchevyman, yes, the ignition timing may have shifted, if the distributor may have moved, but you will need the timing procedure for that vehicle and a timing light to reset it properly. One of the Haynes manuals would be very handy to give that information. I am not familiar with that vehicle, quite obviously it is fuel injected but obviously it has a distributor. Ensure the vacuum system has no leaks anywhere before getting too involved. If the spark-plug leads are original it may be an idea to replace them they do deteriorate significantly over time and can cause odd problems like this also. Change the spark plugs while you are at it. Carefully inspect the distributor cap for any signs of arcing and condition, do a complete visual inspection of all those ignition components. It doesn't take much to knock the guts out of those engines. Cheers, qldit.

10-02-2007, 10:03 PM	#8 (permalink)
Spacemonkey6401 Registered User Join Date: Jul 2006 Location: KS, US Posts: 47 OS: Win XP	Re: 1990 silverado ruff idle Does the fuel spray in a fine mist, or does it drop in? Check all of the vacuum lines as stated above. If not EGR might be the problem.