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Username Post: Engine miss 1993 k1500        (Topic#358265)
familyman 
Poster
Posts: 24

Age: 66
Loc: Memphis Tn
Reg: 07-18-18
09-29-19 07:51 PM - Post#2776739    

GM 5.7 crate engine has about 15,000 miles on it .Has devolved a miss doesn’t sound like one solid miss more like all cylinders missing. Throwing a 32 code something about vacuum,egr .. eve never been changed that I know off . Most older vehicles I just disconnect it but this one still showing code . I replaced distributor ( had 330.000 on it - didn’t help can’t hear any vacuum leaks .Also tach is bouncing around 50-100 rpm never noticed that before... Any help would be appreciated... Sorry for the long post .



 
familyman 
Poster
Posts: 24

Age: 66
Loc: Memphis Tn
Reg: 07-18-18
10-06-19 07:17 PM - Post#2777217    
    In response to familyman

Not egr valve, replaced it . No 32 code any more still running like crap .. appears to me either fire breaking down ( maybe coil ) but it’s not backfiring or maybe injectors in throttle bony ... any ideas anyone



 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3835
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
10-07-19 06:00 PM - Post#2777304    
    In response to familyman

With the tachometer bouncing around I am suspicious of the replacement distributor. At minimum I would have the module tested. Many part stores in my area will test the module for free if you bring it in. Make sure you put heat sink compound under the module when you reinstall it.

Another thing that could be the cause is poor grounds. Make sure the grounds at the rear of the passenger head are in place and in good condition. Also check the grounds at the front of the intake in the thermostat area.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
familyman 
Poster
Posts: 24

Age: 66
Loc: Memphis Tn
Reg: 07-18-18
10-07-19 08:48 PM - Post#2777326    
    In response to familyman

Thanks Chevytech I checked ground by thermostat they are good will check rear of head tomorrow changing distributor didn’t seem to help or hurt guess I could have got a bad one will see if I can have old module checked . Changing EGR did stop code from popping up but didn’t help running one bit .. seems to be getting worse on way home this morning tach bouncing around 100-200 rpm would have died at redlight if I hadn’t kept my foot on it . To bad to drive now .. Will keep y’all updated Thanks again



 
familyman 
Poster
Posts: 24

Age: 66
Loc: Memphis Tn
Reg: 07-18-18
10-08-19 08:21 PM - Post#2777421    
    In response to familyman

Well thought I figured it out today but NO ..Changed MAP sensor no change ..Changed ignition coil ran great drove it 23 miles to work ran great, as I’m easying through parking lot it starts surging & before I get parked it missing bad again ... I don’t know, any ideas??? Didn’t mind to much buying parts they all had 328,000 miles on them



 
stumppuller 
"8th Year" Gold Supporting Member
Posts: 870
stumppuller
Loc: Canada
Reg: 11-01-04
10-08-19 09:34 PM - Post#2777427    
    In response to familyman

If changing the coil made it run good for a short time, and with that high of mileage I would be checking everything that you disturbed while replacing the coil.

Specifically, look at the wiring around the distributor area and it's connectors.

-91 Sierra C2500, now K2500
-81 Chev K20


 
CowboyTrukr 
"8th Year" Silver Supporting Member
Posts: 4255
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
10-08-19 10:20 PM - Post#2777430    
    In response to familyman

Just a thought: A buddy of mine has a mint condition ‘87 K20. His stopped dead on the street one day. We found a loose low voltage connector on the distributor. Snapped it in firmly he and drove away. Never another problem.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3835
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
10-09-19 05:20 AM - Post#2777448    
    In response to stumppuller

I have helped a few people on the messages boards where the problem ended up being loose connections in the plug that plugs onto the distributor. The metal terminals inside the plastic connectors had become stretched out from moving the connector to unplug it.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
familyman 
Poster
Posts: 24

Age: 66
Loc: Memphis Tn
Reg: 07-18-18
10-09-19 10:00 PM - Post#2777523    
    In response to familyman

Thanks will look at that Friday checked grounds today & ping ins on sensors including distributor but didn’t visually look in it .Constant miss now .. about to get the best of me



 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3835
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
10-10-19 02:27 AM - Post#2777528    
    In response to familyman

If you now have a constant miss on one cylinder the problem is not wiring connections on the module of the distributor.

For a constant miss you should be looking to determine which cylinder is misfiring and then you need to find out why it is not firing. If it misses on one cylinder it could be from a spark plug, plug wire, distributor cap, a vacuum leak that mainly affects that one cylinder. Or the problem could be a mechanical issue like a valve problem, flat cam lobe or lack of compression on that cylinder.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
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