98 v70: fail to start when cold

Post by **abscate** » 19 Oct 2023, 02:36

You have simultaneous too rich and too lean codes. Fascinating.

Your long term trim is very high at -21% which suggests a bad over rich condition.

Fuel pressure
Leaky injector
MAF problem

Post by **scot850** » 19 Oct 2023, 05:50

Also the ECT can cause this as well.

Neil.

Post by **CIK7** » 19 Oct 2023, 06:40

scot850 wrote: 18 Oct 2023, 18:38 This thread is a great resource for P80 no starts from cn90:

viewtopic.php?t=52252

In there he lists the 2 pins to jump in the relay seat to get the pump to run continuously. It is pins 15 and 87.

Neil.

Here I am. As usual, I tried to start on FP relay. As usual it began with that no crank. Then I installed the jumper. The result????????????? It started! Ill buy the jumper right now. I hope its safe to use the jumper while away from home. I will bring the old fp relay with me. Dunno why. Just worried. Thank you guys! And to think I was fixated on the cam pos sensor even though it was already replaced...

454cid · Post by **454cid** » 19 Oct 2023, 07:42

CIK7 wrote: 18 Oct 2023, 17:43 Besides your input, something tells me I need a new coolant temp sensor... Joking aside, I am surprised I failed to notice this until now considering that I try to keep the car shipshape. I look in the engine bay every few days for one reason or another.

What are we looking at here?

I see the pictures of your scan tool with the temperature coming up. How long had the car been running? What does the ECT report at first start up, or even before starting the car?

Can you get live O2 readings....graphing would be best. When my 850 had a bad O2 it didn't set a code. The ECM kept trying to add fuel thinking the O2 reading was legitimate.

Post by **Chuck W** » 19 Oct 2023, 09:56

You should use the jumper as only a temporary thing.

What are we looking at in your picture? Is it the ECT sensor connector? Is it jumpered? Is the connector housing just missing?

Post by **CIK7** » 19 Oct 2023, 11:02

454cid wrote: 19 Oct 2023, 07:42
CIK7 wrote: 18 Oct 2023, 17:43 Besides your input, something tells me I need a new coolant temp sensor... Joking aside, I am surprised I failed to notice this until now considering that I try to keep the car shipshape. I look in the engine bay every few days for one reason or another.
What are we looking at here?

I see the pictures of your scan tool with the temperature coming up. How long had the car been running? What does the ECT report at first start up, or even before starting the car?

Can you get live O2 readings....graphing would be best. When my 850 had a bad O2 it didn't set a code. The ECM kept trying to add fuel thinking the O2 reading was legitimate.

I didnt think I had O2 sensors because PO cut out the half-alive cat and put a straight pipe there. But yeah I do..... And now 10min later I am back. Everything O2 related attached below. Be sure to pay attention to the names/labels on pics.

Post by **CIK7** » 19 Oct 2023, 11:07

454cid wrote: 19 Oct 2023, 07:42
CIK7 wrote: 18 Oct 2023, 17:43 Besides your input, something tells me I need a new coolant temp sensor... Joking aside, I am surprised I failed to notice this until now considering that I try to keep the car shipshape. I look in the engine bay every few days for one reason or another.
What are we looking at here?

I see the pictures of your scan tool with the temperature coming up. How long had the car been running? What does the ECT report at first start up, or even before starting the car?

Can you get live O2 readings....graphing would be best. When my 850 had a bad O2 it didn't set a code. The ECM kept trying to add fuel thinking the O2 reading was legitimate.

The picture with the black wires is the one-sided harness of the coolant temp sensor. The car side has the harness and the sensor side only has the two black wires slid onto the harness.

Post by **CIK7** » 19 Oct 2023, 12:56

abscate wrote: 19 Oct 2023, 02:36 You have simultaneous too rich and too lean codes. Fascinating.

Your long term trim is very high at -21% which suggests a bad over rich condition.

Fuel pressure
Leaky injector
MAF problem

I have not checked the codes in quite some time. I think these are just stored codes. Ill come back and update y'all once I have the new coolant temp sensor and fp relay installed.

Post by **CIK7** » 19 Oct 2023, 12:58

scot850 wrote: 19 Oct 2023, 05:50 Also the ECT can cause this as well.

Neil.

Chuck W's comment is the second or third time Ive seen ECT mentioned. What is ECT?

Post by **scot850** » 19 Oct 2023, 13:08

Coolant Temperature sensor. It is the sensor just under the thermostat in the housing (the item in your 17.43 post yesterday on this thread).

Neil.