drifterdude
Frequent Contributor
Posts: 1282
Reg: 09-04-08
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03-27-12 06:27 PM - Post#2208247
In response to koolaid2012
prime and start the truck. Pinch off the fuel return line if the pressure spikes or increases its the regulator if it stays low its the pump.
92 K1500:350 bored 30 over,built 700r4,Comp extreme energy cam,double roller timing set,shaved heads,Rancho RS9000XL series shocks with wireless my ride system,35 inch Mickey Thompson Baja Claws,Relocated 4x4 switch to rocker on Dash.
Other mods.. |
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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03-28-12 07:30 AM - Post#2208406
In response to drifterdude
Where exactly do I pinch it off at?
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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03-29-12 12:17 PM - Post#2208856
In response to koolaid2012
There is a short section of rubber between the engine and where they are together at the fuel filter. Just make sure you don't get the one going to the filter.
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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03-29-12 12:28 PM - Post#2208861
In response to koolaid2012
I know you said the egr hole has been blocked and there was no change but have you pulled the egr diaphram up by hand and covered the port to see how fast it closes back?
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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 someotherguy
Moderator
Posts: 23559
Age: 43
Loc: Texas
Reg: 08-01-03
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03-29-12 04:27 PM - Post#2208953
In response to jham0077
I know you said the egr hole has been blocked and there was no change but have you pulled the egr diaphram up by hand and covered the port to see how fast it closes back?
Not a sufficient test of the EGR valve, and to boot, his V6 may have a linear (electronic) valve vs. vacuum.
Richard
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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03-29-12 05:39 PM - Post#2208975
In response to someotherguy
It does have a linear egr valve
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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03-30-12 06:04 AM - Post#2209115
In response to koolaid2012
 Knew I should have kept to myself when it came to V6s.
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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03-30-12 06:21 AM - Post#2209122
In response to jham0077
Another thing I forgot to mention when I rebuilt my throttle body my Idle air control valve was caked with carbon. I cleaned it, but I how do I know it is still good?
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-02-12 07:28 AM - Post#2210219
In response to koolaid2012
Should I try the pump?
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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04-02-12 12:03 PM - Post#2210319
In response to koolaid2012
That's a tough call to make. If you feel you have eliminated everything else. Did you get the line pinched to see if the pressure raised/spiked? If you do the pump, it's probably easier to pull your bed if you got alot of gas in the tank. Or vice versa if you got alot of stuff in the bed I guess.
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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04-03-12 07:20 AM - Post#2210672
In response to koolaid2012
i call Bad Fuel pump blocked filter or dead regulator! fill it up and drive it is it any better? you could have a crack in the hose in the tank.
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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 04-03-12 07:25 AM - Post#2210673
In response to 350whip
It doesn't run different with a full tank.
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-03-12 07:47 AM - Post#2210682
In response to koolaid2012
Would a delphi pump do good?
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350whip
Contributor
Posts: 116
Reg: 02-24-12
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04-03-12 08:14 AM - Post#2210695
In response to koolaid2012
yep ideal
RickT.
- 1989 chevy k1500
- regular cab, shortbox
- chevy SB350tbi (little piggie!)
- L60E Automatic 4speed
- corvette servo
- 30"BFG AT's
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-03-12 11:35 AM - Post#2210773
In response to 350whip
Could anyone tell me where the bolts that hold the bed on are?
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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04-03-12 11:49 AM - Post#2210778
In response to koolaid2012
They are along the frame. Four or six? Can't remember. The fronts are the most obvious. I'd go out and look at mine but a Tahoe pattern won't do you any good. They will have a size 18mm head on em and be pointing straight up if your laying on the ground. Your tail light harness will need to be unplugged and your filler neck screws taken out.
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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someotherguy
Moderator
Posts: 23559
Age: 43
Loc: Texas
Reg: 08-01-03
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04-03-12 01:21 PM - Post#2210815
In response to jham0077
Eight of 'em, 18mm as described, also don't forget the ground strap off the filler neck and also the ground wire at the rear driver's corner for the taillight harness.
Richard
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jham0077
"2nd Year" Silver Supporting Member
Posts: 329
Loc: Greenville, Il.
Reg: 11-04-11
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04-03-12 02:21 PM - Post#2210833
In response to someotherguy
It's easy to forget the grounds. That's what you end up cussin' about when you drop the bed cause it's still attached. 
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-12-12 12:38 PM - Post#2214333
In response to jham0077
Ok I still haven't been able to get around to changing the pump, but I did hook it up to a obd1 scanner and got some readings. I would appreciate it if anyone would tell me if any of them look funny.
Spark advance was switching from 10 to 13
Fuel Trim 130
Pump had 14v
Map Sensor had 1.2 v and 9.5 hg
Trim cell was 16
Idle at 610
All of this was at idle
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 navygunner08
"2nd Year" Silver Supporting Member
Posts: 644
Loc: New London, CT
Reg: 02-13-11
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04-12-12 02:17 PM - Post#2214369
In response to koolaid2012
BLM (fuel trim) of 130 is not bad at all. 128 is perfect.
10-13 degrees advance at idle is not bad either and the 14V at the pump is good too.
For your MAP reading... 9.5 inches of mercury equates to 32 Kpa. You should have more than 20 inches of mercury at idle with a stock cam.
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-13-12 03:40 PM - Post#2214767
In response to navygunner08
so what would that difference cause?
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 CowboyTrukr
"2nd Year" Silver Supporting Member
Posts: 730
Loc: Salt Lake City
Reg: 06-20-09
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04-13-12 06:25 PM - Post#2214844
In response to koolaid2012
Have you done a compression check? If I'm not mistaken, low vacuum could be an indication of burned valves.
'94 Silverado K2500 4X4 5.7 5spd Xcab LB
RV cam, Pace Setter Headers, TBI spacer, Flow Tech air cleaner adapter, Hypertech street chip
"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke |
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navygunner08
"2nd Year" Silver Supporting Member
Posts: 644
Loc: New London, CT
Reg: 02-13-11
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04-14-12 02:12 PM - Post#2215103
In response to CowboyTrukr
A low MAP reading will throw off your Volumetric Efficiency. The ECM is looking for a certain values from the sensors like your CTS, MAP, and TPS. It uses these readings to establish the amount of fuel to inject along with how much spark advance for a certain loading of the engine. If something isnt right, it is going to throw off the fuel/spark table look ups and ultimately affect how the engine runs.
Edited by navygunner08 on 04-14-12 02:18 PM. Reason for edit: No reason given.
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-15-12 08:52 PM - Post#2215575
In response to navygunner08
OK so i plugged the vacuum hose going to map sensor and it ran better. Would it be bad to run the truck without the map getting proper vacuum?
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someotherguy
Moderator
Posts: 23559
Age: 43
Loc: Texas
Reg: 08-01-03
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04-16-12 04:34 AM - Post#2215622
In response to koolaid2012
Absolutely bad. Without input from the MAP sensor your fuel mixture will be way out of whack as it plays a huge role in that.
Richard
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-16-12 06:18 AM - Post#2215654
In response to someotherguy
If it's not getting the right reading isn't that just as bad? 
I'm just confused on what I should do.
Should I just start back at square one fuel and spark?
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navygunner08
"2nd Year" Silver Supporting Member
Posts: 644
Loc: New London, CT
Reg: 02-13-11
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04-16-12 07:16 AM - Post#2215671
In response to koolaid2012
Im with Richard, just because you have a low MAP reading doesnt mean your MAP sensor is bad.
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-16-12 07:22 AM - Post#2215674
In response to navygunner08
The map is about 2 months old
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navygunner08
"2nd Year" Silver Supporting Member
Posts: 644
Loc: New London, CT
Reg: 02-13-11
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04-16-12 07:22 AM - Post#2215675
In response to navygunner08
Things to remember about MAP readings. When vacuum is high, atmospheric pressure is low (in the cylinders/manifold vacuum). When vacuum is low, pressure is high (more air is actually entering the cylinders). The problem is when you have low vacuum at idle, the ECM is expecting a certain value at a certain RPM to determine the load of the engine. When vacuum is low, engine loading is high (when at idle it should be low). I may have missed this in the thread, but have you verified that you do not have any vacuum leaks, including at your brake booster?
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koolaid2012
Forum Newbie
Posts: 75
Reg: 05-05-11
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04-16-12 07:31 AM - Post#2215678
In response to navygunner08
Yes I have. I even replaced the hose going to the map to make sure it wasn't leaking.
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