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Hard Start After Reaching Temperature #4585229
11/26/17 08:35 AM
11/26/17 08:35 AM
Joined: Dec 2015
Posts: 95
South Dakota
GeorgeKaplan Offline OP
GeorgeKaplan  Offline OP

Joined: Dec 2015
Posts: 95
South Dakota
1999 Chevy 1500 5.7L Vortec.

When starting from dead cold, the engine will fire immediately. However, after reaching operational temperature, being shut off then restarted (Picture driving a distance to a store, shopping in the store, then returning home.) the truck has to crank before starting. Sometimes as long as five seconds. Once running, the engine runs fine. Let it sit until dead cold, it will again fire immediately. Does this in any ambient temperature.

Issue does not seem to be getting worse but the engine does this like clockwork.

No aftermarket parts and the truck is extremely well maintained.

Any ideas?

Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585234
11/26/17 08:38 AM
11/26/17 08:38 AM
Joined: Jun 2003
Posts: 34,076
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,076
ME
flooding? Give it about half gas pedal and see if it catches faster.

Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585241
11/26/17 08:45 AM
11/26/17 08:45 AM
Joined: Sep 2015
Posts: 2,559
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,559
Malaysia
My 1994 Mitsubishi 1.5L 4G15 has similar symptons, otherwise all are fine.

Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585246
11/26/17 08:51 AM
11/26/17 08:51 AM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
When it starts does it come to life as it should, or flutter around/sputter for a second before smoothing out?

Sounds like a symptom of "flooding", but I don't think opening the throttle a little is the solution. Could be a fuel leak into the intake: when cold the fuel has dissipated, but when it hasn't had time to drain off it has to crank to get enough air to fire.

Distributors (which contain the cam sensor) can wear on these. Dist. caps can short out. Injectors, which actually sit in a cluster behind the throttle body, with little tubes ending in poppets clipped into the head ports, can suffer in several ways.

Are you sure the spark plugs are in good shape?


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: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585252
11/26/17 08:57 AM
11/26/17 08:57 AM
Joined: Sep 2014
Posts: 1,565
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline

Joined: Sep 2014
Posts: 1,565
Toronto Canada
The evap system will purge the charcoal canister into the intake manifold at different times. If the system is messed up, it could be dumping air into the manifold at the wrong time, causing a lean mixture and no start. To eliminate this possible cause, remove the purge line from the intake manifold and plug both open ports. Do this only with the engine hot and when you would normally have this problem. If the problem goes away you have found the problem.

Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585253
11/26/17 08:59 AM
11/26/17 08:59 AM
Joined: May 2010
Posts: 9,857
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 9,857
out there
Injectors leaking down into the cylinder after shutdown might cause a flood condition.


13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 9500 miles m1 0w30
Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585261
11/26/17 09:07 AM
11/26/17 09:07 AM
Joined: Jun 2002
Posts: 19,767
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 19,767
Iowegia - USA
I don't know about the V8 for that year but on my 1999 S-10 with the 4.3L V6 the problem was the fuel pressure regulator leaking down and dribbling fuel into the back cylinders.


"I can't change the direction of the wind, but I can adjust my sails to always reach my destination." Jimmy Dean
Re: Hard Start After Reaching Temperature [Re: Alex_V] #4585265
11/26/17 09:11 AM
11/26/17 09:11 AM
Joined: Dec 2015
Posts: 95
South Dakota
GeorgeKaplan Offline OP
GeorgeKaplan  Offline OP

Joined: Dec 2015
Posts: 95
South Dakota
I'll have to pay closer attention. My initial response is to say it runs smooth, otherwise I think I would remember such a thing because having the engine sputtering would make me worry. I'll be leaving for the store in a little while. Cap, rotor, plugs, and wires all new (very little miles) AC Delco installed at a trusted dealer.

Problem also is that I don't drive this vehicle much, the wife does and she doesn't say anything.

Originally Posted By: Alex_V
When it starts does it come to life as it should, or flutter around/sputter for a second before smoothing out?

Sounds like a symptom of "flooding", but I don't think opening the throttle a little is the solution. Could be a fuel leak into the intake: when cold the fuel has dissipated, but when it hasn't had time to drain off it has to crank to get enough air to fire.

Distributors (which contain the cam sensor) can wear on these. Dist. caps can short out. Injectors, which actually sit in a cluster behind the throttle body, with little tubes ending in poppets clipped into the head ports, can suffer in several ways.

Are you sure the spark plugs are in good shape?

Re: Hard Start After Reaching Temperature [Re: WobblyElvis] #4585266
11/26/17 09:12 AM
11/26/17 09:12 AM
Joined: Dec 2015
Posts: 95
South Dakota
GeorgeKaplan Offline OP
GeorgeKaplan  Offline OP

Joined: Dec 2015
Posts: 95
South Dakota
Yikes. I wouldn't know where to start. But thank you.

Originally Posted By: WobblyElvis
The evap system will purge the charcoal canister into the intake manifold at different times. If the system is messed up, it could be dumping air into the manifold at the wrong time, causing a lean mixture and no start. To eliminate this possible cause, remove the purge line from the intake manifold and plug both open ports. Do this only with the engine hot and when you would normally have this problem. If the problem goes away you have found the problem.


Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585273
11/26/17 09:17 AM
11/26/17 09:17 AM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
EVAP sounds like a good base to cover, too. Just have to determine whether you think it's excess fuel or lack of it.

Either way, I think that's one of the best (top 3 - maybe the best) gas truck engines, to boot. Dad has a '97 1/2 ton Suburban with 430K. No more oil consumption than when he got it at 170K, and it's been apart once at 340K for what wound up being a faulty injector - machine shop said the valves didn't really even need done.

Last edited by Alex_V; 11/26/17 09:18 AM.

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: Hard Start After Reaching Temperature [Re: Alex_V] #4585279
11/26/17 09:25 AM
11/26/17 09:25 AM
Joined: Dec 2015
Posts: 95
South Dakota
GeorgeKaplan Offline OP
GeorgeKaplan  Offline OP

Joined: Dec 2015
Posts: 95
South Dakota
Thanks. This vehicle sits a lot. Just turned 75K. Runs like new except for this one issue. I know it's a popular and well regarded engine. I guess I was hoping it was a simple/common problem. Guess not. EVAP or leaking fuel injectors? I will have to send it in and was hoping to avoid doing that.

Originally Posted By: Alex_V
EVAP sounds like a good base to cover, too. Just have to determine whether you think it's excess fuel or lack of it.

Either way, I think that's one of the best (top 3 - maybe the best) gas truck engines, to boot. Dad has a '97 1/2 ton Suburban with 430K. No more oil consumption than when he got it at 170K, and it's been apart once at 340K for what wound up being a faulty injector - machine shop said the valves didn't really even need done.

Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585285
11/26/17 09:37 AM
11/26/17 09:37 AM
Joined: Jun 2003
Posts: 5,979
Illinois
SHOZ Offline
SHOZ  Offline

Joined: Jun 2003
Posts: 5,979
Illinois
If it's flooded flooring the gas as you try to start should fire it up. Otherwise it will just crank and crank.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585286
11/26/17 09:38 AM
11/26/17 09:38 AM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Hopefully the dealership fixes it without fuss or a fortune.

When you do determine the cause and fix, please let us know. I'm curious on this one.

Last edited by Alex_V; 11/26/17 09:39 AM.

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: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585318
11/26/17 10:16 AM
11/26/17 10:16 AM
Joined: Dec 2016
Posts: 8,017
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,017
Waco, TX
My brother's Chevy Malibu had the same exact problem, it turned out to be a sticky fuel pump.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Hard Start After Reaching Temperature [Re: GeorgeKaplan] #4585383
11/26/17 11:15 AM
11/26/17 11:15 AM
Joined: May 2015
Posts: 998
Brittany / Canada
Popsy Offline
Popsy  Offline

Joined: May 2015
Posts: 998
Brittany / Canada
Not sure how this engine works injection wise, but some (failing or dirty) hall effect (magnetic) sensors could exhibit erratic behavior when hot, hence the longer crank time needed before the calculator could get usable info to get the timings right (spark, fuel, etc).
Had a crankshaft position sensor go bad on my car, similar symptoms.

Evap system or injectors leaking could cause some flooding, but I don't put my money on it. Sticky fuel pump...if you let the contact (key) on several seconds before starting, what is happening?
Wonder how's the engine running after hot restart, normal smooth, or not?

Also could sound like some vapor lock symptoms from the carburetor era, haha. No leak on the fuel lines? Is there a fuel filter on this car?


96 Barchetta, 300V 5W40 | Forfour 95, SHU 0W40
Mazda 6 2.3, M1 AFE 0W20 | Colt Ralliart, 300V 0W40
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