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Username Post: Please HELP 88 chevy truck dies while driving        (Topic#157467)
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-19-07 01:30 PM - Post#1146766    

Hey guys I have a 1988 chevy truck with a 5.7 4wd and while driving it stalls and wont restart unless you put the accelerator to the floor then restarts runs rough for a minute then it cleans out and runs ok it does this about 2 to 3 times a day. The codes that it keeps storing are map sensor and coolant temp codes.In the last year I have changed the tps sensor, egr valve, map sensor, coolant temp sensor, o2 sensor, throttle body gasket [ and cleaned the throttle body ], both injectors, checked the timming, replaced the cap, rotor, plugs and wires all with GM parts from the dealer. About a year ago I replaced the computer with a reman one from GM. I also sanded down all of the grounds that I could find. PLEASE HELP. THANKS ALOT.

 
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Trevor350 
Senior Member
Posts: 744
Trevor350
Age: 26
Loc: Georgetown/College Statio...
Reg: 01-25-06
04-19-07 01:52 PM - Post#1146775    
    In response to honda tech

Have you checked thr fuel filter to see of it is clogged.

Could also be a weak fuel pump, hows the fuel pressure?
2007 Summit White SCSB Silverado
3" BL
2.5" CCM
305-70-17 Terra Grapplers
Magnaflow


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-19-07 04:07 PM - Post#1146837    
    In response to Trevor350

Oh ya for got to menchon that I replaced the fuel punp about 8 months ago and the fuel filter about 4 months ago. But I have not checked the fuel pressure lately.

 
N8sToolz 
Very Senior Member
Posts: 2315
N8sToolz
Age: 28
Loc: N 42┬░ 53.290' W71┬░ 34.1...
Reg: 10-23-03
04-19-07 04:34 PM - Post#1146866    
    In response to honda tech

Well just because its new, doesnt mean that its good. Ohm out the TPS, make sure that its good, same with the MAP, you should also have 5v and ground at the map sensor. Check your diagrams, do the TPS and the MAP share a lead? I would localize those first, befre you go tearing into anything else.
1982 Chevy K20 Converted from C20.
355/700R4
2002 Yamaha XVS1100CL VStar
2002 S10 2WD


 
stumppuller 
"4th Year" Gold Supporting Member
Posts: 556

Loc: Canada
Reg: 11-01-04
04-20-07 09:04 PM - Post#1147694    
    In response to N8sToolz

If I remember correctly, the MAP and Coolant are grounded at the same point, at one of the bolts around the thermostat housing.
-91 Sierra C2500, now K2500
-81 Chev K20


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-20-07 09:18 PM - Post#1147698    
    In response to stumppuller

  • stumppuller Said:
If I remember correctly, the MAP and Coolant are grounded at the same point, at one of the bolts around the thermostat housing.


On the grounds that you are talking about I put new connectors on both ground wires and sanded down the t-stat stud.

 
Trevor350 
Senior Member
Posts: 744
Trevor350
Age: 26
Loc: Georgetown/College Statio...
Reg: 01-25-06
04-20-07 10:05 PM - Post#1147711    
    In response to honda tech

have you checked fuel pressure yet?
2007 Summit White SCSB Silverado
3" BL
2.5" CCM
305-70-17 Terra Grapplers
Magnaflow


 
supton 
Member
Posts: 50

Loc: Sutton NH
Reg: 11-29-03
04-22-07 03:59 AM - Post#1148258    
    In response to Trevor350

Sounds like it is flooding out. Sounds like you have replaced all the relevant parts though.

How do the plugs look? Clean, or do they carbon up quickly?
Just looking...


 
someotherguy 
Moderator
Posts: 25894
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
04-22-07 07:08 AM - Post#1148320    
    In response to supton

If you hadn't replaced the CTS already, that's where I'd be pointing. I have my doubts that both the old AND new CTS could be bad.. I guess it's possible, just not likely. Could rule it out if you had a scan tool that would show you what temperature the CTS is reporting. Sometimes when they're bad, they'll show much colder than reality, causing the engine to flood and in serious cases, stall out. Happened to me on the '92 not long ago.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-23-07 01:36 PM - Post#1149290    
    In response to someotherguy

04-22-07 08:08 AM - Post#1148320
In response to supton

If you hadn't replaced the CTS already, that's where I'd be pointing. I have my doubts that both the old AND new CTS could be bad.. I guess it's possible, just not likely. Could rule it out if you had a scan tool that would show you what temperature the CTS is reporting. Sometimes when they're bad, they'll show much colder than reality, causing the engine to flood and in serious cases, stall out. Happened to me on the '92 not long ago.

Richard

Yes I have a scan tool its a snap-on scanner and I also have a snap-on vantage computer. The new cts sensor reads good at all temps.

04-22-07 04:59 AM - Post#1148258
In response to Trevor350

Sounds like it is flooding out. Sounds like you have replaced all the relevant parts though.

How do the plugs look? Clean, or do they carbon up quickly?

The spark plugs look good when I check them when I get back home I have not checked them right after it stalls.

04-20-07 11:05 PM - Post#1147711
In response to honda tech

have you checked fuel pressure yet?

The fuel pressure is about 13 psi

04-19-07 05:34 PM - Post#1146866
In response to honda tech

Well just because its new, doesnt mean that its good. Ohm out the TPS, make sure that its good, same with the MAP, you should also have 5v and ground at the map sensor. Check your diagrams, do the TPS and the MAP share a lead? I would localize those first, befre you go tearing into anything else.

THe new tps and map sensor check good on the snap-on vantage.

 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-23-07 02:11 PM - Post#1149320    
    In response to honda tech

There is another post on this forum from chevy lobster. From what he described his truck is doing the samething he said he replcaed the control moduler does anybody know if that fixed his problem and what is that, is it the pcm?

 
Fixitfox33 
Senior Member
Posts: 1094
Fixitfox33
Loc: North Texas...Denison
Reg: 11-06-04
04-23-07 06:14 PM - Post#1149533    
    In response to honda tech

One other little thing to check, is make sure the ground wire from the engine to the firewall is connected, and in good shape.
Don't fix it if it ain't broke,
But if it's broke...I can Fixit.


"Van" (It's actually Richard....but everyone calls me Van.)


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-23-07 07:25 PM - Post#1149597    
    In response to Fixitfox33

  • fixitfox33 Said:
One other little thing to check, is make sure the ground wire from the engine to the firewall is connected, and in good shape.





Do you kmow wear that ground is located?

 
someotherguy 
Moderator
Posts: 25894
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
04-24-07 05:03 AM - Post#1149809    
    In response to honda tech

The ground is from the rear of the passenger side head to the firewall, right around the area of the A/C dryer.

The module that you read about in another post is inside the distributor.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-24-07 01:39 PM - Post#1150161    
    In response to someotherguy

  • someotherguy Said:
The ground is from the rear of the passenger side head to the firewall, right around the area of the A/C dryer.

The module that you read about in another post is inside the distributor.

Richard



Thanks alot I will try that tomorrow.


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
04-25-07 09:46 AM - Post#1150736    
    In response to honda tech

Late last night I changed the module inside the distributor and when I pulled off the connector that goes to it inside the distributor it fell apart and it was very green so I cleaned it off as good as I could. I also put a ground strap from the exhaust manifold to the frame. I could put it from the head to the body because there was no room to get back there. I will drive it and let you know how it runs.

 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-19-07 06:34 PM - Post#1168629    
    In response to honda tech

what fixed it having same problem please see all my topics txgambler
HELP THANKS

 
old_gto 
Needs to Get Out More Member
Posts: 10826
old_gto
Loc: Orlando, FLA
Reg: 07-13-00
05-20-07 05:03 PM - Post#1169235    
    In response to txgambler

I was going to post a question....but it looks like it fits in here!
I am getting a similar problem from my 97 burb, start it, drive a few feet, and it dies. But it will instantly re-start, and go all day with no other troubles.
It has a new fuel pump, and new plugs & filters only a couple thousand miles ago.
It does not trigger any codes. When it dies, I still have all other electric working, and since it re-starts instantly, it`s hard to imagine fuel related.
Any ideas?
The only thing I`m sure of, is that I`m not sure of anything.
71 Corvette, 97 burb, 66 GTO, 69 Grand Prix, 65 Mustang, 65 C-10 Fleetside, 74 Camaro
Too many toys, not enough play time!


 
honda tech 
Member
Posts: 51

Reg: 12-02-06
05-21-07 03:41 PM - Post#1169963    
    In response to txgambler

  • txgambler Said:
what fixed it having same problem please see all my topics txgambler
HELP THANKS




Well I forgot that I didnt reply back. I replaced the modul inside the distributor and cleaned up the connector that goes to it inside the disributor and I have not had any problems since. Hope that helps.

 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-23-07 01:57 PM - Post#1171374    
    In response to honda tech

how do you check fuel pressure on a 1993 5.7 tbi (i do not see a cnnector)

 
Trevor350 
Senior Member
Posts: 744
Trevor350
Age: 26
Loc: Georgetown/College Statio...
Reg: 01-25-06
05-23-07 03:20 PM - Post#1171414    
    In response to txgambler

you will most likley have to buy a fuel pressure tester (40-50 bucks) at a parts store, and from what I hear you install a T fitting before the fuel filter and check the pressure like that, on the vortecs, there is a schrader valve right behind the TB, and you can just plug in a gauge to that and will give you the pressure reading, but on the TBI's you have to check it at the fuel filter. (Ive never checked fuel psi but have heard this is the way to do it on the earlier TBI's)
2007 Summit White SCSB Silverado
3" BL
2.5" CCM
305-70-17 Terra Grapplers
Magnaflow


 
Boog 
Super Senior Member
Posts: 3570
Boog
Loc: Central Arkansas
Reg: 04-28-02
05-23-07 03:22 PM - Post#1171415    
    In response to txgambler

There is no test port under the hood. You have to Tee into the fuel line from tank where it runs into the fuel filter.
Boog
69 Chevy step
06 GMC ccsb Z71
00 GMC excab Z71
All GM...'nuff said!
JR Nation


 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-23-07 04:18 PM - Post#1171447    
    In response to Boog

thanks 4 the info

 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-23-07 06:55 PM - Post#1171566    
    In response to txgambler

can anyone tell me exact location of ecm on 1993 pickup chevy 5.7 tbi

 
someotherguy 
Moderator
Posts: 25894
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
05-24-07 03:28 AM - Post#1171693    
    In response to txgambler

Behind the glovebox.

If you're gonna check it for a funky connection; get some good contact cleaner/protector spray like De-Oxit, spray some in the connectors and re-install.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-24-07 02:10 PM - Post#1172108    
    In response to someotherguy

thanks what about electronic spark control im getting acode 4 this

 
Trevor350 
Senior Member
Posts: 744
Trevor350
Age: 26
Loc: Georgetown/College Statio...
Reg: 01-25-06
05-24-07 02:31 PM - Post#1172122    
    In response to txgambler

ESC is located to the left of the throttle body mounted on top of the manifold, theres like a 4-5 wire connector going to it. The EGR solenoid, MAP, and one or two other things are connected to that plenum (if thats what its called), ill se if I have a pic
2007 Summit White SCSB Silverado
3" BL
2.5" CCM
305-70-17 Terra Grapplers
Magnaflow


 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-24-07 04:36 PM - Post#1172200    
    In response to Trevor350

a picture would be great i do not see anything

 
someotherguy 
Moderator
Posts: 25894
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
05-25-07 04:06 AM - Post#1172445    
    In response to txgambler

Well partner can't help you with a pic of the actual item since the only one I have handy is of a '94 which doesn't use the same exact setup; though the bracket for it is still there so that should help!



Note the flat bracket to the side of the TBI unit (foreground of the pic, just above the date stamp) - the part on the underside of it is the EGR solenoid. On the older vehicles (probably 93 or 92-down) the ESC is the larger flat package that would be on TOP of this bracket.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
txgambler 
Member
Posts: 27

Reg: 04-09-07
05-25-07 10:16 AM - Post#1172673    
    In response to someotherguy

great picture mine is set up exactly like your picture so maybe a 92 and older. just has a plug hanging mine is a 1993 thanx 4 the help

 
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