Last post on May 10, 2013 at 1:58 PM
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Chevrolet Blazer, GMC Jimmy, SUV
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#3633 of 3674 Re: 1996 Blazer LS Ignition Coil [duntov]
Apr 16, 2011 (11:00 am)
Thank you for the great info...
The ACDelco plugs I used are great... I have more performance... not that it was bad before... just forgot how good it really can be.
I ohmed the wires... ACDelco 7.0mm... all are below 3.0... and they have over 100k on them. I also looks like my mpg is going back up to where it should be... I use to get 300 plus miles on the trip between fill ups... that being around 13 gallons... as I fill up when it is down to 1/4 tank.
I am getting the Arctic Silver 5 heat sink paste... not sure where yet... I will try Advance Auto first... then go to the electronic parts stores.
I want to run it for another full tank... then I replace the coil with an ACDelco one from Advance.
Smoke from hard acceleration is gone.
#3634 of 3674 Re: 1996 Blazer LS Ignition Coil [quantumtouchfl]
Apr 16, 2011 (11:52 am)
I have been using AC Delco #1 Rapid Fire platinum small center electrode spark plugs with a V-clipped ground elctrode and I have had great results with them. However, AC Delco (or who ever in Mexico is making them now) has recently changed the design of the Rapid Fire spark plug and now they appear exactly the same as standard AC Delco CR43TS spark plugs that I can buy for $2.00 each. The "new version" of the AC Delco #1 Rapid Fire spark plugs do not have a small center electrode and they do not have the V-clipped ground electrode and they have a cadimum plated shell instead of a stainless steel shell. The AC Delco 41-803 Professional spark plug seems to have replaced the AC Delco #1 Rapid Fire spark plugs but at an elevated cost of $4.00 each. I feel like this slight-of-hand trick is merely a way to get more money for the standard AC Delco CR43TS spark plugs by relabeling them and selling them as AC Delco #1 Rapid Fire spark plugs. The last set of the bogus appearing AC Delcco #1 Rapid Fire spark plugs I purchased were sent back for a refund.
I am now using Denso "TT" Double-Platinum PTF20TT spark plugs (made in Japan) at $3.25 each and am more satisfied than ever. I am going to avoid the AC Delco off-shore tomfoolery. The Denso "TT" (twin-terminal) PTF20TT are pre-gapped at .040" and are the highest quality spark plugs I have used. My associate has a 2010 Corvette C6 Z06 and it came from the factory equipped with Denso spark plugs. Go figure.
#3635 of 3674 1996 Blazer Fuel Pump Add a second external electric pump
Apr 26, 2011 (11:52 am)
Has anyone thought about adding an external electric fuel pump... near the tank... for those who do not want to have the internal one replaced or the internal has not failed... but fuel pressure is just slightly low... 62psi? If so... is it possible? I know they have pumps that put out 65psi... Mallory for one.
#3636 of 3674 Re: 1996 Blazer Fuel Pump Add a second external electric pump [quantumtouchfl]
Apr 26, 2011 (2:43 pm)
You cannot use a electric in-line fuel pump with a ECM (Engine Control Module) controlled vehicle. The reasons are as follows.
The ECM uses voltage inputs from several sensors to determine how much fuel to give the engine. The fuel is delivered under several modes which are controlled by the ECM.
The modes are:
ECM turns on fuel pump relay for two seconds to allow pump to build up pressure.
Clear Flood Mode
If the engine floods, it can be cleared by pushing the accelerator pedal all the way down. ECM pulses the injectors to a 20:1 air/fuel ratio and holds it as long as the throttle is wide open and engine speed is less than 600 RPM. Returns to starting mode when TPS is below 80% throttle.
Open loop - ECM ignores O2 sensor signal
Closed loop - ECM calculates Air/Fuel ratio based on O2 sensor signal for a 14.7:1 A/F ratio
TPS input, MAP (or MAF) inputs signals ECM to provide extra fuel.
TPS input signals ECM to cut off fuel.
Battery Correction Mode:
ECM compensates for low battery voltage
Fuel Cut Off Mode:
Igniton off- ECM cuts off fuel to prevent dieseling and flooding.
ECM cuts off fuel at high RPM to prevent engine damage.
#3637 of 3674 2001 GMC GIMMY STARTING ISSUES!
May 14, 2011 (9:07 am)
I have a 2001 GMC Jimmy. The problems started off minor. Try to turn over a few times and would not start. Then it would. Husband changed spark plugs first and after that It drove good for a day and then it got were it did-not want to start at all. It would Turn over but not start... Then he changed fuel filter and did good for a few days again and now it's back again- not wanting to start- wiIt ll turn over but not start. When You turn the key to start you can hear the fuel pump kick on loud and strong. Any suggestions on what's next? The fuel pumps are not cheap so I am trying to save that as the last solution! My husband thinks strainer/screen in fuel pump is clogged so is there a way to clean that instead of buying the whole fuel pump? I called around and all Auto Parts stores say's even if screen is clogged I have to buy the whole fuel pump assembly and for this vehicle is like $280+ so I am really trying to save that as my last solution. Any advice will be greatly appreciated.
#3638 of 3674 Re: 1989 Jimmy-s15 Steering Column Issue [Chris1989]
May 27, 2011 (9:13 am)
how did you solve that problem of the dead fish steering column?
#3640 of 3674 Where do I add transmission fluid in my 2002 Blazer?
Jul 07, 2011 (7:31 pm)
I read my owner's manual and tried doing a search on this site...but I couldn't find an answer. My Blazer is low on transmission fluid...at what location do I add more?
#3641 of 3674 97 jimmy sounds like its running on 3 cylinders
Jul 09, 2011 (6:39 pm)
i just replaced my upper and lower intake manifold gaskets due to leaking coolant from the lower gaskets. i put it all back together with all the sensors and wires plug in. i numbered it all and marked everything. the number 1,3 and 6 cylinder is not firing. the number one plug is dry. does any one know whats wrong or did anyone have the same problem please let me know. thank you.
#3642 of 3674 Re: Repost - Suspension Parts [vlkohanski]
Jul 10, 2011 (6:47 am)
moog/mcquay & trw are very good.