Last post on Nov 24, 2013 at 1:32 PM
You are in the GMC Safari & Chevy Astro
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Chevrolet Astro, Fuel System, Van
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#175 of 219 1995 GMC Safari Not Running Smothly
May 18, 2010 (2:38 pm)
Hi all, I'm a new kid on the block, Just joined today............. What I would like to know is if any you guys out there be so kind as to give me some advice about my 1995 GMC Safari?
I found her running very bad with regards power, she would take off ok but after she change into top gear she seems to lack in power, and also I have notice like a rattle or a kinda chain type noise when I go to excelerate with my foot right down on throttle ? As a result I am scared to push her to hard in case I cause more problems. I have just change the oil on her and put new oil filter on and also changed the trans fluid and put new air filter in, but till she is not running well at all, So at the weekend I got me mate to fit a new fuel filter on her hopeing that this will sort it out, but again she is just the same lacking in power???...............
So do any you guys have any idea as to what could be my problem with her?
I live in Belfast, Northern Ireland, and I get all my parts from a dealer in England, so I hope its not going to cost me the earth to fix
Thanks so much for you time in reading this for help!
John, Belfast, Ireland.
#176 of 219 Catalitic converter-?
May 18, 2010 (3:36 pm)
DId you check to see if your catalitic converter is clogged?
May 19, 2010 (3:05 pm)
Hi mate, thanks for ur reply, Ihave not checked the cat converter? how do i go about doing this???
May 20, 2010 (6:03 am)
Check it night, see if it is glowing "red hot" this is an indication that you have a clogged Cat converter,, builds up with carbon, that is one way, look on the net and see if you can't come up with some way of deciphering how to check the cat converter
keep us posted mate,
#179 of 219 Rough idle when stopped at light
Jun 02, 2010 (2:39 am)
I have a 1995 Astro,4.3l z ,cmfi.I have had a problem with the van idling rough at stoplights,but when shifted into Park or Neutral the damn thing runs smooth as can be.In an ongoing attempt to find and fix this problem,(i have 250,000 +)I have never eliminated problem by cleaning egr,iac,etc,fuel pump went amid all this,of course,I caught this one b4 I got stranded yessss,replaced pump,filter,thorough carbon cleaning,tune up,ran sea foam through everything,nothing has made a difference.I wonder if the torque converter really is sticking?Thedistributor shaft feels sturdy,but whadda I know,how can I rule that out?Is the best way to rule out sensors is to unplug them one byone?I have yet to get a code other than 12 from pins on obdm-wan (whatever its called) connector.i'm starting to get pissed now,I broke knock sensor and temp sensor thing trying to reach through beside motor,had to rig those back after I identified them.Now what?Anyone.....anyone......anyone at all.....No,I will not burn it!!Shameful thoughts,does anyone have any ideas that might help me locate and stomp the s**t out of this meddlesome problem for good?Cat converter is cleaned out too
#180 of 219 Re: Rough idle when stopped at light [russ75707]
Jun 02, 2010 (6:41 am)
Check you wires/coil/plugs- there could be carbon build up in the cap,, or wires that are not shielding the spark and arcing.
#182 of 219 94 Astro rough idle & stalling at lights
Jul 12, 2010 (7:41 am)
I know this issue has been addressed but I don't know what to try next.94 Astro 162k starts to idle rough at stops and stalls with more frequency at stop lites,only after car is warmed up.Have removed and cleaned egr,Noticed egr valve was not moving freely,after cleaning problem still there.Valve did not stick when fully depressed to solinoid in egr.Is that a sign it needs to be replaced?Whats the most likely next problem to check? No check engine lite comes on.Mechanic checked dist cap, plugs,wires,and said they were all good.He didn't want to start throwing parts and money at it cause there are are to many possible causes.Saw someone had a fix with vacuum hose & elbow at pcv.Could it also be the IAC?Have new tires and so many new parts I hate to give up,everything else is running great.Any help is greatly appreciated
#183 of 219 Re: 94 Astro rough idle & stalling at lights [Guildman]
Jul 12, 2010 (10:14 am)
Can't edit message so I'll add to it.As with Russ post previously,when I shift to neutral or park at a light problem problem dissipates or mostly gone.4.3 llter cmfi w engine.No hesitation or misfire when driving,only at idle after engine heats,and problem is intermittent.
Jul 13, 2010 (1:15 am)
Not sure, but since you're ok when out of gear I'm wondering about the mysterious Throttle Valve cable -maybe line pressure is off due to electrical/solenoid? It connects the throttle body to the tranny and is full of voodoo. Might want to track down an experienced/trained GM transmission shop to road test diagnose it. There's a science to it. Check the lockup torque converter clutch solenoid. They can stick when hot.
I had trouble with my distributor, timing on a '97. I replaced the timing chain, while in there checked to see that my crankshaft sprocket dot was lined up with my camshaft sprocket dot so my timing could be set. The #4 cyl will be at Top Dead Center now. And the rotor in the distributor will need to be facing the #4 terminal in the distributor cap.
Put a new crank position sensor on (if yours has one) because this can cause issues. The timing chain is a good thing to do just as wise general maintenance anyway. Don't want mine to grenade on me anyway. But I don't really think it's a timing/distributor issue. I suspect a tranny-electrical issue.
Hmmm... let us know what you find please.