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Old 02-26-2010, 10:28 AM   #1 (permalink)
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Hard start, warm

So I have this car in my shop here, my bosses... 02 impala LS 3.8, he tells me that he can hardly start it after he drives around all day frequently shutting the engine down and restarting it. What he says is that it cranks, but it takes him giving some gas before it catches. Any clues? He wants me to figure it out today...

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Old 02-26-2010, 01:00 PM   #2 (permalink)
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Put the ignition to on and see if you can hear the fuel pump. Then turn it off and prime a couple of times more. Then see if it starts up.

I'm thinking if it starts right up after priming it a couple of times, you might have a fuel filter, bad FPR, or pump. I'm leaning towards fuel filter or FPR.

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Old 02-26-2010, 01:54 PM   #3 (permalink)
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Unfortunately I am having trouble getting it to act up, but I am told that it only happens when the vehicle has been cycled many times in one day. The fuel filter was replaced a few thousand miles ago, it had done this once before so I gave it a full 30k and tune-up, delco irridiums for plugs. Specifically, he said that it will fire, immediately die, and then be difficult to start. Once it catches again, he said you have to apply a little throttle or it craps out again. Obviously this is intermittent, but what? TPS? IAC? FPR? There are no codes and my scanner blows, can't read data.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-26-2010, 03:58 PM   #4 (permalink)
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Do a fuel pressure leak down test. You may find an injector leaking down now and then.

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Old 02-26-2010, 04:18 PM   #5 (permalink)
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Lol, I should include a list of my tools in my sig line! This may wind up going to the dealer... I don't have a pressure gauge.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 05-31-2013, 11:01 AM   #6 (permalink)
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BUMP!
i have 2000 impala 3.8l - im having the same problem as this ! any update would be great .

recently changed fuel pump, filter, FPR - thinking maybe it could be starter, coil packs, or battery/alternator related

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Old 05-31-2013, 11:15 AM   #7 (permalink)
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I dunno about king, but mine done the same and it was a crank position sensor. Mine didn't throw a cel until it went completely out. Do you have a cel lit?

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Old 05-31-2013, 11:25 AM   #8 (permalink)
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no cel - i replaced camshaft sensor behind harmonic balancer, MAF , FPR , fuel pump and filter ..
somethins tellin me new battery, or ICM or coil packs , i dnt think its fuel related

that or i need to clean out the throttle body real good ... will keep trying in the meantime and will post back with results as updates arise

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Old 05-31-2013, 02:58 PM   #9 (permalink)
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Sorry I never updated this thread, it turned out to be the ICM in my case.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 06-01-2013, 01:02 AM   #10 (permalink)
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Quote:
Originally Posted by kingnutin View Post
Sorry I never updated this thread, it turned out to be the ICM in my case.

Was just going to mention the ICM. An overheating or failing ICM will cause starting issues once the ICM is warm. Any ICM should have the thermal paste in between the ICM plate and mount replaced every few years. It tends to dry up with the heat and elements. Once it dries up you lose the conductive properties and the ICM starts to overheat and eventually fails.

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Old 06-09-2013, 02:48 PM   #11 (permalink)
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Quote:
Originally Posted by g25racer View Post
Was just going to mention the ICM. An overheating or failing ICM will cause starting issues once the ICM is warm. Any ICM should have the thermal paste in between the ICM plate and mount replaced every few years. It tends to dry up with the heat and elements. Once it dries up you lose the conductive properties and the ICM starts to overheat and eventually fails.
thermal paste? when i took off my icm with coil packs ontop the mount, there wasnt paste there .. i didnt kno i was to put some on either, i jus took it off and swapped it with the new one. as well as new coil packs and still havin the same issue, once it gets hot ,she doesnt catch any spark when i turn her over . :thats what she said: give her some gas tho when turning on and she mite stay on, she mite stall out again. who knows

im thinking starter or new NEW battery, one with more CCA .
or possibly a whole new motor and b done with all the issues ..
but i would like to figure this prob out bcuz it could possibly be someone else's issue as well. not tryin to ressurect an old thread jus want to find multiple solutions if one hasnt worked yet

thanks for all your help

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Old 06-09-2013, 03:25 PM   #12 (permalink)
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Your ICM is likely overheating. There MUST be thermal paste in between the ICM plate and the mount! New ICM's usually come with a little packet of it. Anyways you can pick some up at radioshack, best buy, or computer shops.

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2001 Impala LS
TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
Jbl gto 6.5" and 6x9" with trunk amp bypass
Sony MEX-GS600BT stereo

"Apply Dielectric Grease or I kick some arse"
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Old 06-10-2013, 10:42 AM   #13 (permalink)
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Yep. Replacing the starter certainly isn't going to help with an ignition problem, and if it were the battery it wouldn't only do it warm. Get some thermal paste in there and pray you haven't already fried your new ICM.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 06-11-2013, 10:09 AM   #14 (permalink)
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Sorry for the newb question...but what is the ICM?
my fathers 03 impala with 78k miles has been doing this since hes had it. he got it at 32k miles. at some points he cant even get a crank with the key, it has to be done through remote start. thanks for all and any help.

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Old 06-11-2013, 01:41 PM   #15 (permalink)
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Ignition Control Module.

That won't prevent the car from cranking, it only controls spark. I would guess the problem with your dads car is probably a bad ignition switch, common problem, and an easy fix.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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