87 R10 lq4 help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zach_carver · 01-28-2019, 08:48 PM

I'm looking for some guidance. I have a 87 chevy r10 we've swapped a lq4/4l80e into. Truck is crammed btr stage 4 truck cam, and circle d stall. Truck runs great, idles good and all is well. However truck wont move in any gear. We've now had two different tuners look into segment swap and all. Range sensor has been removed from tune also. You guys ever heard of seen anything similar? We've replaced the harness in trans, and we've added another ground to transmission also.

**mongocanfly** · 01-28-2019, 09:46 PM

Was trans good before the swap?....

87chevy.com · 01-28-2019, 10:00 PM

If you installed the torque converter and ot wanst seated all the way in, chances are you broke the front pump.. super common if you dont know.... I'd imagine a quick test is to disconnect both fluid lines at the cooler and see if fluid gushes out when the motor is cranked over and running..
Atleast that's how I'd imagine testing of the pump is broken
Clint

Usually when a tuner fant figure it out, it's a mechanical problem

Big Moose · 01-28-2019, 10:06 PM

^^^What he said. Another thing you could do is hook up a gauge and check your line pressure

zach_carver · 01-28-2019, 11:46 PM

Truck has made s one mile drive perfectly. But it was right after the segment swap was done in tuning. And it only lasted maybe one mile.It doesn't have any gears forward or backwards. I guess we could pull one line and see what fluid comes out. It was supposed to be a 80k mile motor and trans that operated perfectly when pulled.

BR3W CITY · 01-29-2019, 10:36 PM

Is the trans from the same donor? There are two wiring configs for the 4l80e pre ~97 and after. The trans harness, main harness, and tune need to be setup for the same stuff. Usually replacement harnesses are made for the "new" configuration, but its worth noting if your chasing wiring problems.

If it ever worked at all then the tune isn't the problem. Trans tuning can't cause intermittent issues, unless something in the trans being commanded is SO off that it causes a limp condition.

Didn't see you mention if any codes were being thrown? (including t- or u- codes).

zach_carver · 01-30-2019, 10:52 AM

It was throwing a range sensor code before the second tuner tuned it out I think was po706. I havent scanned it sense to see if it has any new DTCs. Ill scan it and see what it says. Were using a PSI harness, but yea motor/ trans were from the same vehicle but ecm wasnt from same vehicle.

01-28-2019, 08:48 PM	#1
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	87 R10 lq4 help I'm looking for some guidance. I have a 87 chevy r10 we've swapped a lq4/4l80e into. Truck is crammed btr stage 4 truck cam, and circle d stall. Truck runs great, idles good and all is well. However truck wont move in any gear. We've now had two different tuners look into segment swap and all. Range sensor has been removed from tune also. You guys ever heard of seen anything similar? We've replaced the harness in trans, and we've added another ground to transmission also. __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

01-28-2019, 09:46 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,585	Re: 87 R10 lq4 help Was trans good before the swap?.... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

01-28-2019, 10:00 PM	#3
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,255	Re: 87 R10 lq4 help If you installed the torque converter and ot wanst seated all the way in, chances are you broke the front pump.. super common if you dont know.... I'd imagine a quick test is to disconnect both fluid lines at the cooler and see if fluid gushes out when the motor is cranked over and running.. Atleast that's how I'd imagine testing of the pump is broken Clint Usually when a tuner fant figure it out, it's a mechanical problem __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

01-28-2019, 10:06 PM	#4
Big Moose Registered User Join Date: Dec 2018 Location: Alberta Posts: 71	Re: 87 R10 lq4 help ^^^What he said. Another thing you could do is hook up a gauge and check your line pressure

01-28-2019, 11:46 PM	#5
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: 87 R10 lq4 help Truck has made s one mile drive perfectly. But it was right after the segment swap was done in tuning. And it only lasted maybe one mile.It doesn't have any gears forward or backwards. I guess we could pull one line and see what fluid comes out. It was supposed to be a 80k mile motor and trans that operated perfectly when pulled. __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

01-29-2019, 10:36 PM	#6
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 87 R10 lq4 help Is the trans from the same donor? There are two wiring configs for the 4l80e pre ~97 and after. The trans harness, main harness, and tune need to be setup for the same stuff. Usually replacement harnesses are made for the "new" configuration, but its worth noting if your chasing wiring problems. If it ever worked at all then the tune isn't the problem. Trans tuning can't cause intermittent issues, unless something in the trans being commanded is SO off that it causes a limp condition. Didn't see you mention if any codes were being thrown? (including t- or u- codes). __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

01-30-2019, 10:52 AM	#7
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: 87 R10 lq4 help It was throwing a range sensor code before the second tuner tuned it out I think was po706. I havent scanned it sense to see if it has any new DTCs. Ill scan it and see what it says. Were using a PSI harness, but yea motor/ trans were from the same vehicle but ecm wasnt from same vehicle. __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE



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