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Username Post: 89 350 running rich        (Topic#186588)
Tailgater 
Forum Newbie
Posts: 50

Loc: Saint John, NB
Reg: 12-04-07
04-06-08 03:04 PM - Post#1405353    

HI guys,

I bought this truck a few months back and have been slowly going over it fixing it up, the latest problem is that the truck seems to be running really rich, I replaced the plugs and wires which made it run abit better, then I noticed the O2 sensor was broke off, so I replaced that, but the truck still seems to run rich, I'm getting blackish grey smoke out the tailpipes when I floor it. I took the aircleaner off today while it was running and looked down the throttlebody and I could see gas sort of pooling on the butterflys while it was idleing.
The ses light is not on, and there are no codes coming up. Any ideas on what might be wrong?

Thanks,

Chris
1978 GMC long wheelbase stepside
1986 Monte Carlo
1989 Chevy Silverado
2004 SRT 4


 
59 EWW 
Very Senior Member
Posts: 1871
59 EWW
Loc: Kansas City Kansas
Reg: 08-31-03
04-06-08 03:51 PM - Post#1405394    
    In response to Tailgater

Hey Chris,

Normal starting place on running rich symptoms, is to replace the CTS, coolant temperature sensor, the one mounted at the thermostat housing.

Dont over look any wiring or connector issues at the sensor either.

Start there, and post back with results.
Ernie

59 Biscayne 2dr
65 Elcamino
97 Z71,K1500,5.7
06 GMC Canyon


 
someotherguy 
Moderator
Posts: 25142
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
04-06-08 03:51 PM - Post#1405396    
    In response to Tailgater

Since you've already addressed the O2 sensor, the next thing to check is the coolant temperature sensor (CTS). Look at the FAQ post at the top of this forum; there's a link in there to a post about testing your CTS to see if it's good or not. If it's bad, usually it reads colder than it should be, telling the ECM to richen up the fuel mixture. Often a bad CTS will not trip a trouble code because the ECM thinks it's behaving normally, just that the temperature is colder than it really is.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
Tailgater 
Forum Newbie
Posts: 50

Loc: Saint John, NB
Reg: 12-04-07
04-06-08 04:56 PM - Post#1405445    
    In response to someotherguy

Thanks for the quick replys guys!, its too dark out to check the cts now, but I'll try and test it tommorow and post back with my results.

Thanks again,

Chris
1978 GMC long wheelbase stepside
1986 Monte Carlo
1989 Chevy Silverado
2004 SRT 4


 
Tailgater 
Forum Newbie
Posts: 50

Loc: Saint John, NB
Reg: 12-04-07
04-07-08 02:04 PM - Post#1406109    
    In response to Tailgater

Ok, I just got in from checking the CTS, what i did was unplug the connector on it and put my two leads from the multimeter on the contacts on the sensor, no matter what range i chose on the meter It just displayed 1. so it looks like the sensor is faulty, I'll pick up a new one later this week and let you guys know if that cures it.

Thanks for the help,

Chris

1978 GMC long wheelbase stepside
1986 Monte Carlo
1989 Chevy Silverado
2004 SRT 4


 
Tailgater 
Forum Newbie
Posts: 50

Loc: Saint John, NB
Reg: 12-04-07
04-08-08 05:07 PM - Post#1407041    
    In response to Tailgater

ok quick update, I changed the cts today, truck runs alot better now, I'm still getting alot of black smoke under heavy throttle but I imagine that is just built up carbon burning off so I'll probably try running some combustion chamber cleaner thru it and see if that helps.

I'd be lost trying to figure this stuff out on my own, thanks again for the help.

Chris
1978 GMC long wheelbase stepside
1986 Monte Carlo
1989 Chevy Silverado
2004 SRT 4


 
gator120 
Newbie
Posts: 3

Loc: Janesville, WI
Reg: 04-11-08
04-12-08 06:08 PM - Post#1410015    
    In response to Tailgater

Not sure if I have the same problem or just similar. '93 chevy van w/ v-8 parked all winter was running good for 20 miles then started running rich upon acceleration, ran ok down the highway and would idle ok, just very rich when you took off. On way home it would kill at idle and restart with foot to floor. No codes and checked EGR, seems ok. Also having trouble finding FAQ info that was referred to? Thank You.


 
JasonZ 
Ultra Senior Member
Posts: 11090

Age: 26
Loc: Erie, Pennsylvania
Reg: 02-21-03
04-12-08 06:14 PM - Post#1410024    
    In response to gator120

  • gator120 Said:
Not sure if I have the same problem or just similar. '93 chevy van w/ v-8 parked all winter was running good for 20 miles then started running rich upon acceleration, ran ok down the highway and would idle ok, just very rich when you took off. On way home it would kill at idle and restart with foot to floor. No codes and checked EGR, seems ok. Also having trouble finding FAQ info that was referred to? Thank You.





Replace the temp sensor. My truck was doing that today and I replace it and it helped dramatically.
Don't go BROKE trying to look RICH. Act your WAGE!!


 
gator120 
Newbie
Posts: 3

Loc: Janesville, WI
Reg: 04-11-08
04-16-08 06:16 PM - Post#1412994    
    In response to JasonZ

Sure enough, solved the problem. It sure is the small things that make it run like crapp isn't.

 
someotherguy 
Moderator
Posts: 25142
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
04-17-08 06:20 AM - Post#1413296    
    In response to gator120

Hey gator,

The FAQ is one of the posts at the top of this forum's list, with the little blue "i" icon next to it. It's a list of links to different posts concerning some of the more common problems with our trucks. Under the engine section you'll see "running rich" - there's info in there about testing the coolant temperature sensor.

However, sounds like you've got it covered. A bad CTS really is a frequent cause of a too-rich condition on these engines, though it's not necessarily the only cause.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
chesterv 
Forum Newbie
Posts: 26

Reg: 12-01-12
12-02-12 09:29 AM - Post#2294275    
    In response to someotherguy

Good morning, 1st off I'm new to this site joined yesterday 12-1-12. I have a 1989 Chevy sprint motorhome 350 cu 2bbl tbi. I get parts by calling it a G30 van. It sat for 5 years, till I ran it through emmisions June 2009 {passed no problems} drove it 300 miles then parked it. I started it once a month and noticed in the spring of 2010 that it started to run rough when it was due for emmisions in Dec 2010, it failed. I parked it and it wouldn't run anymore.I replaced the pickup coil on the distributor and got it to idle again. I've tried a completely new distributor with cap & all & throttle position sensor,that I have since returned to the parts store. I have replaced the fuel pump, sock & filter, rebuilt TBI. I got it running again but it runs very rich {only idles that is} as soon as I give it gas it dies. I replace the CTS yesterday and it seems to be slighly better, but still won't go above idle,I have the timing set at 9*BTDC. This motor used to run strong, but once in awhile it would die while driving down the hwy, it would immediatley start right back up. It has 90K miles on it,any suggetions would be appreciated. Thanks Chester

 
BBSOCA2012 
Forum Newbie
Posts: 79
BBSOCA2012
Loc: Southern CA
Reg: 10-21-12
12-02-12 09:55 AM - Post#2294286    
    In response to chesterv

Chester, maybe try starting a new thread instead of posting in someone else's thread. It might get you an answer sooner than later.
1999 GMC Yukon, all stock, even the wheels/tires...this will change as time goes on

Sundance 34' TT by HEARTLAND


 
chesterv 
Forum Newbie
Posts: 26

Reg: 12-01-12
12-02-12 11:05 AM - Post#2294299    
    In response to BBSOCA2012

I'll do that thanks

 
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