No Start
#1
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
No Start
Car would not start last night.
Battery good, engine turns well, just does not fire.
Tried swapping the fuel pump relay - no help.
No injector clicking noise, so don't suspect the LH.
The fuel pressure guage I had installed on the fuel rail stays at zero so it appears the fuel pump is not energizing.
Thoughts?
Thanks.
Battery good, engine turns well, just does not fire.
Tried swapping the fuel pump relay - no help.
No injector clicking noise, so don't suspect the LH.
The fuel pressure guage I had installed on the fuel rail stays at zero so it appears the fuel pump is not energizing.
Thoughts?
Thanks.
#2
Fuse, relay, crank position sensor or the fuel pump finally went out.
#3
Rennlist Member
Randy,
All 3 of the LH's I have had rebuilt did not provide the ground to energize the fuel pump relay. Instead of using another relay, try jumpering the fuel pump at 30 and 87. I drove the Stepson to SITM with a jumper at the fuel pump, and it was fine, but I had an on/off switch inline so I could turn it off when stopped.
All 3 of the LH's I have had rebuilt did not provide the ground to energize the fuel pump relay. Instead of using another relay, try jumpering the fuel pump at 30 and 87. I drove the Stepson to SITM with a jumper at the fuel pump, and it was fine, but I had an on/off switch inline so I could turn it off when stopped.
#4
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Randy--
Got one of those siamesed jumper pigtail switches for the FP relay socket? Try that and see if the pump runs. That simple diagnostic cuts the available causes in half. If the pump runs with jumper, the problem is somewhere between the CPS and the FP relay, including the EZK and the LH. If the pump doesn't run, think connection in the battery well (one of the red aux wires on the battery plus post), the fuse/fuseholder, or the pump(s). Divide and conquer.
Got one of those siamesed jumper pigtail switches for the FP relay socket? Try that and see if the pump runs. That simple diagnostic cuts the available causes in half. If the pump runs with jumper, the problem is somewhere between the CPS and the FP relay, including the EZK and the LH. If the pump doesn't run, think connection in the battery well (one of the red aux wires on the battery plus post), the fuse/fuseholder, or the pump(s). Divide and conquer.
#5
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
...And I have a spare/loaner 013 LH box (full diagnistics) rebuilt on the shelf here if you need it to test. PM me and we'll work out logistics.
#6
Supercharged
Rennlist Member
Rennlist Member
Join Date: May 2002
Location: Back in Michigan - Full time!
Posts: 18,925
Likes: 0
Received 63 Likes
on
36 Posts
If the injectors are not clicking, then it's not the fuel pump relay or fuel pump (but you may still want to check fuse #38 to be sure). I would look at the LH relay (XXV).
It may also be the EZK relay (XXII) because I think the CPS signal runs through the EZK first, and then to the LH. WIthout this signal the LH will not energize the fuel pump or run the injectors.
It may also be the EZK relay (XXII) because I think the CPS signal runs through the EZK first, and then to the LH. WIthout this signal the LH will not energize the fuel pump or run the injectors.
Trending Topics
#8
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
Haven't checked spark yet - running down the fuel pump as it is not pressurizing the system. The fuel pressure guage comes in handy as a first-tier diagnostic tool.
Thanks for the suggestions so far, gents. I had to drop the car at my 928 mech as I needed to get into the office.
Jumpering 30 and 87 of the fuel pump relay did not get power to the pump. We do have power at the relay.
How would we test to determine if it is the security system imobilizing the ignition/fuel pump?
Thanks for the suggestions so far, gents. I had to drop the car at my 928 mech as I needed to get into the office.
Jumpering 30 and 87 of the fuel pump relay did not get power to the pump. We do have power at the relay.
How would we test to determine if it is the security system imobilizing the ignition/fuel pump?
#9
Rennlist Member
Haven't checked spark yet - running down the fuel pump as it is not pressurizing the system. The fuel pressure guage comes in handy as a first-tier diagnostic tool.
Thanks for the suggestions so far, gents. I had to drop the car at my 928 mech as I needed to get into the office.
Jumpering 30 and 87 of the fuel pump relay did not get power to the pump. We do have power at the relay.
How would we test to determine if it is the security system imobilizing the ignition/fuel pump?
Thanks for the suggestions so far, gents. I had to drop the car at my 928 mech as I needed to get into the office.
Jumpering 30 and 87 of the fuel pump relay did not get power to the pump. We do have power at the relay.
How would we test to determine if it is the security system imobilizing the ignition/fuel pump?
WSM 97 page 479.
#12
Rennlist Member
Jumpering 30 to 87 on teh relay will give you 12v at the fuse, irrespective of any other condition, as its a feed directly from the battery, and the pumps should run.
When you check fuse contuinity, look for +12v from both ends of it to ground.
When you check fuse contuinity, look for +12v from both ends of it to ground.
#14
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
While I'm thinking of it what does 'LH' and 'EZK' stand for?
We toss the term around so frequently I don't recall what they are acronyms for.
We toss the term around so frequently I don't recall what they are acronyms for.
#15
i have the hammer on loan right now, so its in San Diego