DieselTalk

DieselEngineTrader's FREE Diesel Engine Forums

new topic search Categories login View GM Diesel Engines

CATEGORY LISTINGS > GM DIESEL > 94 6.5 diesel, 72 mph for 10 sec =limp mode [ REFRESH ]
Thread Title:

94 6.5 diesel, 72 mph for 10 sec =limp mode


Created On Thursday December 01, 2005 18:37 Diesel Talk
Diesel Talk Forum

mudpuppy
Diesel Talk Forum
Posts: 1
Joined: Dec 2005

Note Thursday December 01, 2005 18:37 View thread in raw text format
Diesel Talk
i have a 94 chevy 6.5 truck, that if you drive 72 miles an hour for more than 10 sec, kicks a 78 code then loses power(limp mode), i can keep driving it this way, it just doesn't have any power. if i shut it off and restart it the code light goes off and the power comes back.
78 code is wastegate solenoid fault, i already had to replace it once and it fixed the boost problem, but didn't fix the losing power at 72 mph. i can run 71 all day and no problem. it will also kick this code if you put it to the floor from the start. it does that at about the top of second gear. the turbo is new from bullydog, it's a 96 upgrade(16lbs boost). the vacuum pump is new and the wastegate solenoid is new, i rebuilt the transmission(4L80e), and replaced speed sensor on the transmission, which was faulty. i checked the map sensor for correct voltage and it seems fine. i can drive over 72mph as long as i keep letting of the gas every 9 seconds!! CAN ANYONE HELP???????????? confused


Edited: Thursday December 01, 2005 at 18:58 by mudpuppy
Diesel Talk Forum
Reply Diesel Talk Forum Quote Diesel Talk Top Diesel Talk Forum Bottom Diesel Talk
Diesel Talk Forum
Diesel Talk Forum

owner19946point5turbodiesel3500silverado
Diesel Talk Forum
Posts: 2
Joined: Jan 2006

Note Saturday January 28, 2006 22:42 View thread in raw text format
Diesel Talk
same thing with me, all i did was switch the hoses around, on the solenoid wastegate thats is on top of your engine on left side above valve cover, try switch the 2 plastic hoses around.. it fixed my problem when i was replacing the old plastic hose, they cracked so i used brake linings and installed them wrong and i got the same problem you had.. but my truck is 1994 chevy silverado 3500 with manual 5spd 4x4 but the problem you described is very similar to mine ! so try switch the plastic hoses around.. it should fix it..let me know if it solves the problem for you..
Diesel Talk Forum
Reply Diesel Talk Forum Quote Diesel Talk Top Diesel Talk Forum Bottom Diesel Talk
Diesel Talk Forum
CATEGORY LISTINGS > GM DIESEL [ REFRESH ]
Diesel Sales
Select Reman Exchange LLC
Big Bear Engine Company
Luoyang Diron Parts Trading Co.,Ltd
Young & Sons Inc.
Advertize on Diesel Engine Trader

Customer Testimonials

Newsletter

Subscribe to our mailing list to get all the latest DET news.as well as daily or weekly notifications of new engines and spare parts listings.

'We bought a new John Deere engine via DieselEngineTrader.com for a great price and were able to sell it locally for $1000 less than our competition. We really appreciate the website - it's great!'

Ben Kauffman, Quaker Machine, PA, USA

'DieselEngineTrader.com is a very good resource. I use it to search for engines I need and have also advertised a Volvo Penta engine and received some genuine enquiries. Our local market is small and DieselEngineTrader.com helps me to reach a worldwide market.'

Dimitris Constantinou, Limassol, Cyprus

'We love your site! Got a customer in Germany through our ads in DieselEngineTrader.com and made a $130k sale to him for a CAT C32 engine!'

Grant Tremelling, Northern Equipment & Machine, Idaho, USA

Copyright Diesel Engine Trader 2015