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EFI car spark plugs cause a crank with no start!? #4579988
11/20/17 11:15 AM
11/20/17 11:15 AM
Joined: Jun 2008
Posts: 5,410
In the Garage...
ls1mike Online content OP
ls1mike  Online Content OP
Joined: Jun 2008
Posts: 5,410
In the Garage...
So the Buick I have been working on is all done. Runs nice and smooth.
Did the following. Intake gasket, valve cover gaskets, hoses, water pump, new radiator, shift kit, new transmission fluid and a bunch of other small stuff.

Go to start it, crank but no start. I think "Weird" I have spark, fuel and of course air. I pull the plugs they look bad, so I decide to replace them.

Stock gap is .057 to .060. The ones I pulled were just under .080.

New plugs and started first crank. Was just weird to me. I have never had that happen on an electronically controlled car that was running when I started working on it.

I have to assume that having the correct gaskets installed and correct fuel curves made the 20 year old spark plugs just not enough.


Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4579994
11/20/17 11:20 AM
11/20/17 11:20 AM
Joined: Aug 2008
Posts: 21,166
ON, Canada eh?
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 21,166
ON, Canada eh?
Sometimes it's just a weird coincidence. I swear someone is messing with us on the regular sometimes though. LOL

Last edited by StevieC; 11/20/17 11:21 AM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4579998
11/20/17 11:23 AM
11/20/17 11:23 AM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
I've seen numerous cars start and run more-or-less fine on plugs worse than .02" over spec gap, but I've also noted how much quicker and cleaner a 3800 V6 started with a set of new Delco iridiums. Strange that it wouldn't start at all, though.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: EFI car spark plugs cause a crank with no start!? [Re: Alex_V] #4580004
11/20/17 11:28 AM
11/20/17 11:28 AM
Joined: Jun 2008
Posts: 5,410
In the Garage...
ls1mike Online content OP
ls1mike  Online Content OP
Joined: Jun 2008
Posts: 5,410
In the Garage...
Originally Posted By: Alex_V
I've seen numerous cars start and run more-or-less fine on plugs worse than .02" over spec gap, but I've also noted how much quicker and cleaner a 3800 V6 started with a set of new Delco iridiums. Strange that it wouldn't start at all, though.


Yep, the plugs when pulled were wet with fuel. We put Delco Iridiums in there. Thing runs really nice now. Makes good boost. [censored] kit really helped.


Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4580032
11/20/17 11:50 AM
11/20/17 11:50 AM
Joined: Sep 2004
Posts: 7,796
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,796
Marshfield , MA
You disturbed a bunch of stuff doing the intake gasket. Air flow sensors ,etc. The engine took a few seconds to figure out where it was. Mean time fuel was pumped as normal , no air, coupled with large gap.. Flooded Had you let it st overnight, it may have started normally. New plugs along with all the other stuff , means you won't be back under the hood for awhile.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: EFI car spark plugs cause a crank with no start!? [Re: andyd] #4580037
11/20/17 11:55 AM
11/20/17 11:55 AM
Joined: Jun 2008
Posts: 5,410
In the Garage...
ls1mike Online content OP
ls1mike  Online Content OP
Joined: Jun 2008
Posts: 5,410
In the Garage...
Originally Posted By: andyd
You disturbed a bunch of stuff doing the intake gasket. Air flow sensors ,etc. The engine took a few seconds to figure out where it was. Mean time fuel was pumped as normal , no air, coupled with large gap.. Flooded Had you let it st overnight, it may have started normally. New plugs along with all the other stuff , means you won't be back under the hood for awhile.


We let it sit over night. It was a crank and no start until the new plugs were installed. Started ran perfect. I have never seen anything like it.


Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4580072
11/20/17 12:48 PM
11/20/17 12:48 PM
Joined: Mar 2017
Posts: 674
West Ma.
rollinpete Offline
rollinpete  Offline
Joined: Mar 2017
Posts: 674
West Ma.
Originally Posted By: ls1mike
Originally Posted By: andyd
You disturbed a bunch of stuff doing the intake gasket. Air flow sensors ,etc. The engine took a few seconds to figure out where it was. Mean time fuel was pumped as normal , no air, coupled with large gap.. Flooded Had you let it st overnight, it may have started normally. New plugs along with all the other stuff , means you won't be back under the hood for awhile.


We let it sit over night. It was a crank and no start until the new plugs were installed. Started ran perfect. I have never seen anything like it.


If you unhooked the battery that may have been the reason why it didn't want to start right away


Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive185k miles
Last Change;
50/50 QSUD, QSHM. 5w30
Fram XG8A, Fram CA8141

Currently under the influence of oil shocked2

Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4580078
11/20/17 12:56 PM
11/20/17 12:56 PM
Joined: Jun 2008
Posts: 5,410
In the Garage...
ls1mike Online content OP
ls1mike  Online Content OP
Joined: Jun 2008
Posts: 5,410
In the Garage...
Battery was not unhooked over night, it was before that, but remained hooked up after the initial cranking and not starts.


Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT
Re: EFI car spark plugs cause a crank with no start!? [Re: ls1mike] #4580120
11/20/17 01:51 PM
11/20/17 01:51 PM
Joined: Dec 2016
Posts: 201
Wisconsin
emmett442 Offline
emmett442  Offline
Joined: Dec 2016
Posts: 201
Wisconsin
80 thou is a pretty big gap. And, correct me if I'm wrong, but these old pigs use a waste spark system. Perhaps the resistance was just too high with the old plugs.

After removing the intake, it's certainly possible that a little coolant made its way onto the plugs as well. That wouldn't help either.

Then, after they were fuel fouled, there was no hope.


2011 Ford Crown Victoria LX 4.6L V8 auto
2009 Chevrolet Malibu LT 2.4L I4 auto
1974 Dodge D200 360 V8 4 speed manual
Re: EFI car spark plugs cause a crank with no start!? [Re: emmett442] #4580144
11/20/17 02:39 PM
11/20/17 02:39 PM
Joined: Jun 2008
Posts: 5,410
In the Garage...
ls1mike Online content OP
ls1mike  Online Content OP
Joined: Jun 2008
Posts: 5,410
In the Garage...
Originally Posted By: emmett442
80 thou is a pretty big gap. And, correct me if I'm wrong, but these old pigs use a waste spark system. Perhaps the resistance was just too high with the old plugs.

After removing the intake, it's certainly possible that a little coolant made its way onto the plugs as well. That wouldn't help either.

Then, after they were fuel fouled, there was no hope.


I bet you are right. There was no way to get all the coolant out. I cleaned out what I could but I am pretty sure it there was still some in there.


Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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