3800 ENGINE RUNS ROUGH AT COLD START UP

1996 Buick Regal

Tiny

Firemnted

May, 5, 2012 AT 9:57 PM

15 Miles on rebuilt engine New Temp sensor replaced twice new MAP sensor new TPS New upstream O2S New Thermostat

FOUND 4561 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

31 Answers

Tiny

ASEMaster6371

May, 5, 2012 AT 10:00 PM

Lets get back to basics. How are the plugs and wires?

Did you use the old injectors and have they been cleaned with direct injection?

I would not go to any sensors till you cover all your basics first.

Roy

Tiny

Firemnted

May, 5, 2012 AT 10:08 PM

Used injectors but cleaned. Plugs and wires are new and rechecked. The car did sit for 11 months with a full tank of fuel treated with sea foam. I have a scan tool and had no output from the sensors I replaced. The car starts and runs perfectly every time when it gets to 150 deg. F vida the scan tool!

Tiny

ASEMaster6371

May, 5, 2012 AT 10:13 PM

Monitor the coolant sensor when cold

Roy

Tiny

Firemnted

May, 5, 2012 AT 10:16 PM

70 Deg. This morning and out side temp. Was 57.2 so I replaced it today with no change

Tiny

Firemnted

May, 5, 2012 AT 10:18 PM

Air intake temp. Was 47 Deg.

Tiny

ASEMaster6371

May, 5, 2012 AT 10:20 PM

Air intake will not effect it. It is the coolant sensor, the temp of the coolant. It gives a richer mixture when cold. It may be running lean

Roy

Tiny

Firemnted

May, 5, 2012 AT 10:24 PM

That was what I thought and why I replaced it a second time day the first was when I rebuilt the engine! I still have the original should I try that?

Tiny

ASEMaster6371

May, 5, 2012 AT 10:48 PM

The temp sensor you said, was that the sensor by the thermostat housing or on the back of the head

Roy

Tiny

Firemnted

May, 5, 2012 AT 11:03 PM

Thermostat Housing

Tiny

ASEMaster6371

May, 5, 2012 AT 11:06 PM

What was the reading on the scan tool when cold?

Roy

Please login or register to post a reply.

Code Read Retrieval/Clear Mercedes-Benz C230
How to read codes Chevrolet Blazer
Code Read Retrieval/Clear Scion XD
Code Read Retrieval/Clear Mercedes Benz
 Step by Step video GMC Yukon XL 2000-2006
Code Read Retrieval/Clear Honda Civic
Read Codes Like a Pro