1989 strumbling when hot with no code
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Normandy
1989 strumbling when hot with no code
Hi,
1st excuse for my bad english
My Vette is a 1989 AT.
When the engine is cold it's ok.
After 40miles my engine strumbles and could stall if I drive slowly.
SES is lighting when it strumbles but there is no code except 12.
As the SES is lighting, the fuel consommation is blocked (dash board indication)
I put these new parts:
-pick up coil
-fuel pump
-fuel filter
-sparks
-cool temp sensor
Thank you for your assistance
1st excuse for my bad english
My Vette is a 1989 AT.
When the engine is cold it's ok.
After 40miles my engine strumbles and could stall if I drive slowly.
SES is lighting when it strumbles but there is no code except 12.
As the SES is lighting, the fuel consommation is blocked (dash board indication)
I put these new parts:
-pick up coil
-fuel pump
-fuel filter
-sparks
-cool temp sensor
Thank you for your assistance
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
First thing to do is stop replacing good parts, and start testing what youre pulling out before you replace it.
Next thing to do is get the igniton control module tested.
Then check all the wiring to all the sensors. Check the AIR system while youre at it.
This stumble will be probably either fuel or spark, if you can get 40 miles before it occurs id guess at spark and look to ignition control module.
Next thing to do is get the igniton control module tested.
Then check all the wiring to all the sensors. Check the AIR system while youre at it.
This stumble will be probably either fuel or spark, if you can get 40 miles before it occurs id guess at spark and look to ignition control module.
Heel & Toe
Joined: Mar 2007
Posts: 24
Likes: 0
From: Ohio
Mine was doing the same thing and 4 of my fuel injectors were shorting out. Check the ohm readings all should be in the 16-17 ohm range. Check cool and then again when warm also. My car was getting to much fuel when in closed loop and running rich. Technically it still as as I haven't replaced the injectors yet.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Normandy
EGR is disable with this:http://cgi.ebay.com/ebaymotors/86-89...spagenameZWDVW
but my engine had the default before I put it.
Thank U
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Normandy
First thing to do is stop replacing good parts, and start testing what youre pulling out before you replace it.
Next thing to do is get the igniton control module tested.
Then check all the wiring to all the sensors. Check the AIR system while youre at it.
This stumble will be probably either fuel or spark, if you can get 40 miles before it occurs id guess at spark and look to ignition control module.
Next thing to do is get the igniton control module tested.
Then check all the wiring to all the sensors. Check the AIR system while youre at it.
This stumble will be probably either fuel or spark, if you can get 40 miles before it occurs id guess at spark and look to ignition control module.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Normandy
Mine was doing the same thing and 4 of my fuel injectors were shorting out. Check the ohm readings all should be in the 16-17 ohm range. Check cool and then again when warm also. My car was getting to much fuel when in closed loop and running rich. Technically it still as as I haven't replaced the injectors yet.
I keep contact
Philou
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Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Might have to start going through all the wiring and making sure its all nice and firm, sounds like its going to be one of those simple little things that is a ***** to track down.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
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From: Normandy
I'd be doing a fuel pressure test while driving, to see if the pressure dropped when the stumbling occured.
I have mounted a LT1 fuel pump because old was bad when hot
cold engine with my old TPi pump at 700rpm: 32 psi
hot engine with my old TPi pump while accelerating : 26 psi
But I have always the bug.
You're right, 1st I must see the presure when stumbling occured.
I have mounted a LT1 fuel pump because old was bad when hot
cold engine with my old TPi pump at 700rpm: 32 psi
hot engine with my old TPi pump while accelerating : 26 psi
But I have always the bug.
You're right, 1st I must see the presure when stumbling occured.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Normandy
Might have to start going through all the wiring and making sure its all nice and firm, sounds like its going to be one of those simple little things that is a ***** to track down.
It's the charm of the TPi
It's the charm of the TPi
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Time to test things that will no cause a code. Fuel pressure (especially when the demand on the pump is highest), injectors (ohm hot and cold, also fuel pressure leakdown), ICM and pickup coil, FPR, spark plug check and ohm plug wires, check the connections on all engine function sensors and the above mentioned.
New parts can fail too.
New parts can fail too.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
I would bet a six pack of good beer that his injectors are starting to crap out due to shorted turns in the coils. This is so easy to check too! Spec is 16.5 +/-.3 ohms. All eight should be very close to the same value.
philou: let us know what you find to be the problem.
philou: let us know what you find to be the problem.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
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From: Normandy
