Diagnostics

This post provides step-by-step instructions on how to properly time the DS4 injection pump on the GM 6.5L Turbo Diesel engine. We have divided the pr...

This code is very common, we often see it brought up multiple times per day across various Facebook groups. Diagnosis is as follows. PO216 = 6.5L OBDI...

To perform a Passlock system relearn, make sure the vehicle battery is fully charged, as it will be used for 30 minutes without the alternator for cha...

This document is for deep dives into troubleshooting diagnostic trouble codes (DTC) on both OBDI and OBDII 6.5L EFI vehicles Stanadyne Service Bulleti...

The purpose of this article is to document the troubleshooting steps for cylinder imbalance codes on a DS4 6.5L EFI fuel injection system DTC 91-98 WI...

This guide provides step-by-step instructions for setting the timing on a DS4 injection pump using a scan tool with TIME SET and TDCO Learn capabiliti...

See the attached file for our general guide on how to time a DB2 pump on the 6.2 and 6.5L platform This guide is geared toward the DIY user who doesn'...

https://quadstartuning.com/products/engine-coolant-temperature-fooler The Engine Coolant Temp (ECT) fooler is a diagnostic tool used to fool the compu...

The TORQUE application is an Android app that can read codes and display live data for any OBDII vehicle. We have expanded on the default functionali...

Scan tool is essential for proper diagnosis 1994-1995 models: OBD1 system 1996-2000 models: OBD2 system Diagnostic codes differ between year ranges Po...

This article provides a comprehensive overview of the 6.5L Diesel EFI Systems, focusing on the operation and diagnostics of these engines. Three Stage...

If you're dealing with issues with a Stanadyne DB2 mechanical pump, this guide will help you diagnose and potentially resolve common problems. Let's d...

Customer Reports: " Pull out onto the main road, rpms only go to 2200 and no power. Lags at 2200 for a moment finally shifts to second gear. This repe...

Get the timing set and give us some data from your scan tool. We don't like to guess without data so you'll be scratching your head without doing this...

Having issues starting your diesel vehicle in cold weather? This guide provides tips to help diagnose and improve starting in temperatures as low as -...

All 1996 and later 6.5L vehicles utilize the OBDII protocol which will require an OBDII scanner to query codes from the DLC under the steering column....

Diagnostic Trouble Code (DTC) 1994-1995 Trucks use 8192 Baud Data (OBDI).  You can simply count flashes of the CEL/SES light on the dashboard after g...