Question about 1985 Chevrolet S-10
Trouble codes 13 and 44
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
try the "tap test" on the ecm. After closed loop,just lightly tap on the computer,you may see it change or stall.Mine did that and the ecm was bad.
Posted on Aug 21, 2009
The black soot on the plugs means that you are running extremely rich. The fuel injectors ma test good electricly, but they are notorious for leaks. The spider-looking thing sandwiched between the plastic intake plenum and the intake manifold gets cracks in it's "legs" and leaks fuel ito the plenum area. The fuel pressure regulator is also housed in this same assembly. if the diaphram in the regulator gets a pinhole in it, it also leaks fuel into the plenum area, causing all kinds of erratic idleing, black smoke from the exhaust, and will cause your fuel trims to drop into the negative 20s.
There is a technical service bulletin covering this subject. This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI (Multiport Flexible Injection) Fuel System.
It is removing the injectors which are all housed in the center body of the injector assembly and replacing them with a new version where the injectors are located where the ols "poppets" used to be in the intake manifold ports. The picture below is for a V-8 engine that is covered by the same TSB.
The poppets and the pressure regulator are available individually to fix your existing fuel injection system, but I gave up on that after replacing several poppets only to have them come back in a few months with another popet line broken. I recommend replacing the whole assembly with the new and improved version. My customers have told me after doing this that the engine never ran that smooth when it was new.
The GM part number for the new injector assembly for your V-6 engine is 12568332 it is also now available at several aftermarket parts outlets.
As for the timing chain solution posted by doodieman200, all I have to say is that I have enough fingers on one hand to count all of the failed timing chains I have replaced on these engines. If you don't have a cam/crank sync code, the timing chain has definitely not slipped a tooth.
Posted on Oct 18, 2009
Testimonial: "thank for tech update. due to working in a fleet bus shop i no longer get regular tech bulletins"
SOURCE: Have trouble code 45 on
1994 Chevrolet S10 Blazer 4.3L, Vin W
DTC 45 The spark plugs are black on both banks. Right bank plugs are damp. Removed the tuning valve and looked inside the plenum. Can see a washed/clean area on the right side. Fuel pressure is good, it holds when the pump stops.
1. Remove the upper intake plenum cover and inspect for a fuel leak at the fuel pressure regulator.
2. Inspect the fuel pressure regulator and return lines and fittings at the left side of the plenum.
3 Replace the Central Multipoint Fuel Injection (CMFI) unit. Potential Causes: Leaking Fuel Line - One or more may have a problem.
Leaking Fuel Pressure Regulator
Tech Tips: The fuel pressure regulator may only leak at a cold or hot engine, only with vacuum applied, or only without vacuum applied. The leaking at the fuel lines and fittings have as often been the result of repairs as the initial cause of the problem. Handle the lines and fittings carefully. The fuel pressure regulator is a integral part of the Central Multi-port Fuel Injection (CMFI) unit. Any failure requires entire unit replacement.
Posted on Mar 03, 2011
Tips for a great answer:
Jul 30, 2015 | Cars & Trucks
Jun 29, 2015 | Nissan Cars & Trucks
Jun 17, 2015 | Cars & Trucks
Sep 13, 2012 | Saab 9 3 Cars & Trucks
Nov 07, 2011 | 1997 Nissan Sentra
Jul 21, 2011 | 1989 Buick Century
May 05, 2011 | Buick Park Avenue Cars & Trucks
Jan 27, 2010 | 1997 Mazda 626
Nov 13, 2009 | 1995 GMC Sierra C1500
Jun 10, 2009 | 1991 Oldsmobile Cutlass Supreme
23 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: