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DOHC rear plugs, easy solution

engine firewall lip out rear reverse

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#1 Psych0matt

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Posted 15 February 2011 - 05:33 AM

So after some fidgeting around I finally found the perfect combo to get the rear plugs out. This can be done without removing anythings, without rocking the engine, without cutting the firewall lip. I did all three of my rear plugs in under 15 minutes, and the hardest part was just getting the wires back in because of the goofy plastic tubey thingy that they go in.Here's what you'll need:1/2" socket wrench1/2" 5" extensionPosted Image1/2" to 3/8" socket adaptorPosted Image3/8" universal jointPosted Image3/8" 3" extensionPosted Image3/8" extension connected to your spark plug socketPosted ImageHere's what you do:First remove the plug wire. You may have to use a little bit of force and some twisting and wiggling, but it can be done. With the socket and first extension already connected, lower it into the plug hole enough so that you can still hold it with one hand (and not drop it in). Once you have it down far enough for the second 3" extension to be down past the lip, pop it on to the first extension. Drop it a little further so you can get the U joint on. At this point you should be able to get the socket most of the way down onto the plug. You should be able to now pop the adaptor on, and then the 5" extension. Once you do this, it's pretty self explanatory. You'll have to loosen the plug and then reverse the process (removing each section), but then you should have your plug out, and installation of the new plug is reverse. Again, took me all of 15 minutes to do all three, and half that time was probably fighting to get the wires back on :D

Edited by Psych0matt, 15 February 2011 - 05:36 AM.

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#2 94 olds vert

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Posted 15 February 2011 - 12:06 PM

Good idea, if you don't want to rock the engine. I just removed my dog bone and rocked the engine, didn't take me that long either.

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#3 GOT2B GM

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Posted 15 February 2011 - 12:46 PM

Or, disconnect the dogbone, and back the car up onto ramps, shut it off, and put it in park or 1st gear allowing the weight of the car to roll the engine forward. Then you don't need a universal joint and the spark plug boots are much easier to get in. Also taping your socket / extensions together is a good idea so your socket doesn't fall off the extension when down there.

Edited by GOT2B GM, 27 February 2011 - 02:06 PM.

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Matt Shantz

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'01 GMC Yukon Denali  LQ4 - 4L65-E - GM CK375's - Corsa Sport exhaust - Volant Intake - Westers Tune -  Pioneer double DIN

'97 Buick LeSabre Custom  Top Swapped L36 - 4T60-E - Regal GS wheels - Pioneer double DIN - 3.6 MPS - SD headers

'98 Dodge Dakota Sport 3.9 Magnum - NV3500R/T wheels - LUND rollpan - Dynomax exhaust - Boss flip out 

'95 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple White - 18" Eagle 077's - Pioneer double DIN
'90 Pontiac Turbo Grand Prix LG5 - 4T60-HD #0058 of 2749 -Slammed - 14.6@95 MPH - Pioneer flip out
'94 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple Black - 17" Eagle 077's - JVC DVD
'12 Buick Regal GS LHU - F40 - Brembos - Nav - 20's - BNR / EFIlive tuned - GM Stage Kit - ZZP DP

'88 Pontiac Fiero GT  L44 - 282 - Leather - Panasonic flip out

'92 Pontiac Grand Prix GTP  LQ1 - 282 - 17" Eagle 077's

'92 Chevrolet Lumina Z34  LQ1 - 284 - 18" SS wheels
 

 

 


#4 Psych0matt

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Posted 15 February 2011 - 01:58 PM

I know, I know, there are other methods! :lol: For me this is by far the easiest. I don't want to to use ramps to do spark plugs though, or disconnect the dogbone if I don't have to. I kinda did this writeup just so in a year or whenever I do this again, I don't have to do any of that, and I don't have to scratch my head trying to remember! Just seemed like a good alternative for someone who doesn't like taking crap apart to do something that shouldn't require taking crap apart :lol:

'92 5 speed GTP - Mod list _____ '06 Grand Prix SE - Daily Driver

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#5 fastbird232

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Posted 18 February 2011 - 06:10 AM

I know, I know, there are other methods! :lol: For me this is by far the easiest. I don't want to to use ramps to do spark plugs though, or disconnect the dogbone if I don't have to. I kinda did this writeup just so in a year or whenever I do this again, I don't have to do any of that, and I don't have to scratch my head trying to remember! Just seemed like a good alternative for someone who doesn't like taking crap apart to do something that shouldn't require taking crap apart :lol:

You've pretty much nailed it. This is how I did my LQ1 plugs, and there's really nothing to it.
1994 Pontiac Grand Prix SE sedan

#6 Red Nightmare

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Posted 26 February 2011 - 08:20 PM

ON my LQ1, I have never had any real problems getting the back plugs out. tight squeeze yes but seems just enough room that with the right extensions you can get to them. Sometimes I rock the engine but even that is not really necessary. Is my 94 GTP set up in some fashion that is not usual? For rocking it, I just rock the car and apply the park brake when it is forward.
1994 Pontiac Grand Prix GTP. 3.4 DOHC with 197,000 miles, 4 speed automatic.

#7 carkhz316

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Posted 27 February 2011 - 03:42 PM

Cut the half-circle slices out of the weatherstrip flange on the front of the cowl. Works like a charm and can be covered back up with the weatherstripping. Tis what I did on my '92 when I had it at school. I then did my engine-bay jamming/ painting, and it looks like they're supposed to be cut like that. No U-joints or adapters required as it's a straight shot at the plugs then. Just my .02
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#8 Psych0matt

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Posted 27 February 2011 - 05:54 PM

Yeah, all good options, not arguing that, but again my main issue was the concept of why should you have to modify something that you should be able to do without modifying? Just my opinion on what's best/easiest for me :thumbsup:

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#9 virtuetovice

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Posted 27 February 2011 - 07:39 PM

1. Remove dash 2. Put 3 holes in firewall 3. Remove plugs 4. Install new plugs 5. ????????????? 6. PROFIT :thumbsup:

this IS a General Motors product and the general rule is that nothing should make actual sense.

who knew a pansy-ass 2.8L V6 would sound so glorious :lol:

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#10 94 olds vert

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Posted 27 February 2011 - 07:50 PM

5. ????????????? = Install DIS and UB3.

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#11 99screaminregal

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Posted 28 February 2011 - 01:59 PM

Thas' how I did mine. Just took the weather stripping off and went to town on it. :thumbsup:
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#12 Steel Head

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Posted 22 March 2011 - 02:42 AM

Yes very easy using the right socket extensions and swivel, designers should really have some knowledge in mechanics so they can design cars better. Something as easy as changing spark plugs should not be so difficult :roll: IMO ;)
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#13 95pghvert

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Posted 19 April 2011 - 03:34 AM

im having a hell of a time with the rear plug wires on my cutty...i got her back today and changed them but now it runs and spits n pukes, Iam thinking i didnt get the plug wires all the way down on the plug....So basically you disconnect the dog bone and it will rock forwards? Iam afraid of doing that but is it just that simple ( im no where near a mechanic is why i ask) i just like trying things first before i pay someone to do it

#14 GOT2B GM

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Posted 19 April 2011 - 03:37 AM

Unbolt the dogbone and you can pull it forward, try a ratchet strap, or park it facing downhill so the weight of the car pushes on the parking pin in the trans and rocks it forward. You won't hurt the car.

Matt Shantz

sig_zpsxeyfp1pg.jpg

'01 GMC Yukon Denali  LQ4 - 4L65-E - GM CK375's - Corsa Sport exhaust - Volant Intake - Westers Tune -  Pioneer double DIN

'97 Buick LeSabre Custom  Top Swapped L36 - 4T60-E - Regal GS wheels - Pioneer double DIN - 3.6 MPS - SD headers

'98 Dodge Dakota Sport 3.9 Magnum - NV3500R/T wheels - LUND rollpan - Dynomax exhaust - Boss flip out 

'95 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple White - 18" Eagle 077's - Pioneer double DIN
'90 Pontiac Turbo Grand Prix LG5 - 4T60-HD #0058 of 2749 -Slammed - 14.6@95 MPH - Pioneer flip out
'94 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple Black - 17" Eagle 077's - JVC DVD
'12 Buick Regal GS LHU - F40 - Brembos - Nav - 20's - BNR / EFIlive tuned - GM Stage Kit - ZZP DP

'88 Pontiac Fiero GT  L44 - 282 - Leather - Panasonic flip out

'92 Pontiac Grand Prix GTP  LQ1 - 282 - 17" Eagle 077's

'92 Chevrolet Lumina Z34  LQ1 - 284 - 18" SS wheels
 

 

 


#15 Psych0matt

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Posted 19 April 2011 - 03:38 AM

i once connected a strap to my brothers jeep and then threw the jeep into neutral and let the weight pull the engine a bit. Worked like a charm

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#16 95pghvert

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Posted 19 April 2011 - 03:44 AM

and im guessing to get it back to its desired spot you just drive it forwards and line the dogbone back up?....I didnt know it was so easy! i hope it goes this easy in the morning LOL thanks guys!

#17 GOT2B GM

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Posted 19 April 2011 - 03:54 AM

you should be able to rock it by hand once the weight of the car is off the park pin.

Matt Shantz

sig_zpsxeyfp1pg.jpg

'01 GMC Yukon Denali  LQ4 - 4L65-E - GM CK375's - Corsa Sport exhaust - Volant Intake - Westers Tune -  Pioneer double DIN

'97 Buick LeSabre Custom  Top Swapped L36 - 4T60-E - Regal GS wheels - Pioneer double DIN - 3.6 MPS - SD headers

'98 Dodge Dakota Sport 3.9 Magnum - NV3500R/T wheels - LUND rollpan - Dynomax exhaust - Boss flip out 

'95 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple White - 18" Eagle 077's - Pioneer double DIN
'90 Pontiac Turbo Grand Prix LG5 - 4T60-HD #0058 of 2749 -Slammed - 14.6@95 MPH - Pioneer flip out
'94 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple Black - 17" Eagle 077's - JVC DVD
'12 Buick Regal GS LHU - F40 - Brembos - Nav - 20's - BNR / EFIlive tuned - GM Stage Kit - ZZP DP

'88 Pontiac Fiero GT  L44 - 282 - Leather - Panasonic flip out

'92 Pontiac Grand Prix GTP  LQ1 - 282 - 17" Eagle 077's

'92 Chevrolet Lumina Z34  LQ1 - 284 - 18" SS wheels
 

 

 


#18 gryfan

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Posted 19 April 2011 - 09:07 PM

So after some fidgeting around I finally found the perfect combo to get the rear plugs out. This can be done without removing anythings, without rocking the engine, without cutting the firewall lip. I did all three of my rear plugs in under 15 minutes, and the hardest part was just getting the wires back in because of the goofy plastic tubey thingy that they go in. Here's what you'll need:1/2" socket wrench1/2" 5" extensionPosted Image 1/2" to 3/8" socket adaptorPosted Image 3/8" universal jointPosted Image 3/8" 3" extensionPosted Image 3/8" extension connected to your spark plug socketPosted Image Here's what you do: First remove the plug wire. You may have to use a little bit of force and some twisting and wiggling, but it can be done. With the socket and first extension already connected, lower it into the plug hole enough so that you can still hold it with one hand (and not drop it in). Once you have it down far enough for the second 3" extension to be down past the lip, pop it on to the first extension. Drop it a little further so you can get the U joint on. At this point you should be able to get the socket most of the way down onto the plug. You should be able to now pop the adaptor on, and then the 5" extension. Once you do this, it's pretty self explanatory. You'll have to loosen the plug and then reverse the process (removing each section), but then you should have your plug out, and installation of the new plug is reverse. Again, took me all of 15 minutes to do all three, and half that time was probably fighting to get the wires back on :D

thanks matt, that is going to save me some time and cut knuckles. hat's off to you. :thumbsup: cheers, gryfan

#19 95pghvert

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Posted 19 April 2011 - 09:10 PM

I connected a strap to the engine after i parked it on the ramps and loosened the dogbone, connected the strap to my jeep and pulled it did the trick...Got the wires in with no problems, it started up and ran real well untill i got on the highway, it started to spit n puke, I wonder if the bit of water down in the thing would cause that

#20 GOT2B GM

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Posted 19 April 2011 - 09:21 PM

Plugs gapped properly?

Matt Shantz

sig_zpsxeyfp1pg.jpg

'01 GMC Yukon Denali  LQ4 - 4L65-E - GM CK375's - Corsa Sport exhaust - Volant Intake - Westers Tune -  Pioneer double DIN

'97 Buick LeSabre Custom  Top Swapped L36 - 4T60-E - Regal GS wheels - Pioneer double DIN - 3.6 MPS - SD headers

'98 Dodge Dakota Sport 3.9 Magnum - NV3500R/T wheels - LUND rollpan - Dynomax exhaust - Boss flip out 

'95 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple White - 18" Eagle 077's - Pioneer double DIN
'90 Pontiac Turbo Grand Prix LG5 - 4T60-HD #0058 of 2749 -Slammed - 14.6@95 MPH - Pioneer flip out
'94 Oldsmobile Cutlass Supreme Vert LQ1 - 4T60-E - Triple Black - 17" Eagle 077's - JVC DVD
'12 Buick Regal GS LHU - F40 - Brembos - Nav - 20's - BNR / EFIlive tuned - GM Stage Kit - ZZP DP

'88 Pontiac Fiero GT  L44 - 282 - Leather - Panasonic flip out

'92 Pontiac Grand Prix GTP  LQ1 - 282 - 17" Eagle 077's

'92 Chevrolet Lumina Z34  LQ1 - 284 - 18" SS wheels
 

 

 






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