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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Modern Electronic Engines> 1989 C1500 Drivability Problem(Surge/Stutter)
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Topic Review (Newest First)
01-07-2012 08:42 PM
40 grey UPDATE: EGR valve finally showed up and was installed today. Made sure passages were clean(it was). Night and day difference. Problem is completely gone and truck is smooth again! Thanks to all who offered help, it never hurts to have more info.
01-04-2012 10:34 PM
ChevyTruckGuy
Quote:
Originally Posted by 40 grey
I do not own the GM manuals. I do have an old, well used and trusty Motors manual. But I do have access to the GM manuals through work. Through these and an old Snap-on scanner most things can be observed/tested, even if it is done crudely! I have a fair amount of experience with junk and low budgets.
Thats good you have manuals because with out them is just guessing I found that out the hard way! Go to the web site one of the best for chevy trucks!
01-04-2012 09:06 PM
40 grey I do not own the GM manuals. I do have an old, well used and trusty Motors manual. But I do have access to the GM manuals through work. Through these and an old Snap-on scanner most things can be observed/tested, even if it is done crudely! I have a fair amount of experience with junk and low budgets.
01-04-2012 08:55 PM
ChevyTruckGuy
Quote:
Originally Posted by 40 grey
Thanks to all for their help and suggestions. After further testing and retesting, the EGR valve was found to be intermitantly sticking open when solenoid commanded it open(cruise over 40mph). Oddly enough it would manually test okay, held vacuum, and pintle moved freely off the truck. When on the truck it would sometimes not seat or open freely after it was hot. New one(ac-delco) is coming tomorrow. Hopefully this is the problem. ---

---BTW, it ran pretty good with automatic ecm and prom. Low idle(500rpm), and shift light on steady were only observed problems.-----
That is what I was thinking was wrong! But with out the 3 shop manuals I don't know how you new everything was working correctly? Not unless you have the 3 shop manuals? Also here is a good site for trucks and mods www.fullsizechevy.com

Craig
01-04-2012 08:43 PM
40 grey Will do. Intake was hot tanked with the rest of the engine parts at rebuild, so I'm pretty sure it's clean. But will check at install. Thanks.
01-04-2012 08:24 PM
EagleMark and make sure the passege in engine is clean/not plugged!
01-04-2012 08:18 PM
40 grey Thanks to all for their help and suggestions. After further testing and retesting, the EGR valve was found to be intermitantly sticking open when solenoid commanded it open(cruise over 40mph). Oddly enough it would manually test okay, held vacuum, and pintle moved freely off the truck. When on the truck it would sometimes not seat or open freely after it was hot. New one(ac-delco) is coming tomorrow. Hopefully this is the problem. ---

---BTW, it ran pretty good with automatic ecm and prom. Low idle(500rpm), and shift light on steady were only observed problems.-----
01-01-2012 06:09 PM
EagleMark VSS on a lot of Chevy trucks is in the speedometer.

700r4 does have a park/Neutral switch and also a brake switch, when brake off TCC will lock up, when brake on TCC off. HTH!
01-01-2012 05:14 PM
LATECH
Quote:
Originally Posted by 123pugsy
Standard tranny has no torque converter.

700r4 does not have the shift position/neutral safety switch. You're thinking of the later 4L60e.

1989 700r4 should have the VSS. Not sure how the signal from the 5 speed is done.
Hee Hee, took my eye off the ball pugsy,
what are the odds that the knock sensor is acting up?Just a thought.
01-01-2012 05:08 PM
123pugsy Standard tranny has no torque converter.

700r4 does not have the shift position/neutral safety switch. You're thinking of the later 4L60e.

1989 700r4 should have the VSS. Not sure how the signal from the 5 speed is done.
01-01-2012 10:37 AM
LATECH After re reading this post it occured to me that what youre describing sounds like a torque converter lock up shudder and not an electronic problem.
depressing the brake pedal unlocks the converter to aid in braking the vihicle. Why I mention this you ask?
If you want to determine the torque converter is the problem, drive the vehicle, you will need to use both feet. Run the gas with your right foot, when the problem starts acting up, lightly touch the brake so as to disengage the torque conveter, if the problem quits when you touch the brake then the issue is with the torque converter.
If that is the case,a fluid change would be a possible fix.50/50, either it will or it wont.Its the least expensive thing to try.
If that doesnt fix it, you may need to replace the torque converter.
01-01-2012 10:29 AM
EagleMark
Quote:
Originally Posted by 40 grey
Okay, thanks for the help. The alternate prom (and ecm) is out of the same year truck with a 5.7 and 700r4. Known good(or atleast was), took it out myself from running truck. My truck has a 5-speed, don't know if this will make a big difference as far as diagnostics are concerned. But thanks , I have some more things to look at now.
Just swap your chip to the new ECM... actaully the 1227747 has 2 removable chips, one is limp home for catastrophic failure, the other is the one the engine runs on. Just swap both.
12-26-2011 07:44 PM
LATECH The ECM from the truck with the 700r4 will require a signal input from a shift lever sensor to tell the ecm the truck is in gear. With a standard you wont have that. The timing curves between the 2 computers will be noticeably different due to that alone. The computer/prom from the auto trans model may seem sluggish.
However it could still provide you with a usable test result if the misfire, bucking, jerking goes away. If it does, then swap the PROM over to the replacement ECM and drive it again to see if it is still OK. If it is, That would indicate the trouble was the ECM and not the prom.
12-26-2011 07:27 PM
40 grey Okay, thanks for the help. The alternate prom (and ecm) is out of the same year truck with a 5.7 and 700r4. Known good(or atleast was), took it out myself from running truck. My truck has a 5-speed, don't know if this will make a big difference as far as diagnostics are concerned. But thanks , I have some more things to look at now.
12-26-2011 07:01 PM
LATECH This may help ID your unit
http://www.exatorq.com/ludis_obd1/idxref.html
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