Hard start - all of a sudden
06-16-2018, 09:59 PM
#1
Rennlist Member
Thread Starter
Hard start - all of a sudden
My signature says "starts on a bump" but that has changed. Today I noticed that I had to crank for about 5 seconds before she chugged to life. Driving is perfect but I also noticed a distinct gas smell just after she fired when I got out of the car.
I installed new cold start injector and the other injector (cant remember the name) when I got her dialed in a couple of years ago.
To you respected members, what could it be now?
I installed new cold start injector and the other injector (cant remember the name) when I got her dialed in a couple of years ago.
To you respected members, what could it be now?
06-17-2018, 10:55 AM
#3
Rennlist Member
How old are your fuel lines? How old are your fuel pressure regulators? I hope they're not still original. If they are, you could have a leak.
After sitting a while, say 2 weeks, my car never starts right up. What I've learned to do is quickly bump the starter, enough to get the fuel pump running, and then stop cranking the motor. Listen to the fuel pump whine as it builds pressure. Then when the fuel pump shuts off go ahead and start. It then fires right up.
After sitting a while, say 2 weeks, my car never starts right up. What I've learned to do is quickly bump the starter, enough to get the fuel pump running, and then stop cranking the motor. Listen to the fuel pump whine as it builds pressure. Then when the fuel pump shuts off go ahead and start. It then fires right up.
06-17-2018, 11:09 AM
#4
Rennlist Member
Another fairly obvious choice might be the battery - check the voltage across the terminals and make sure it has juice sufficient for a crisp start.
06-17-2018, 12:10 PM
#5
Rennlist Member
Thread Starter
I will tell you that I have a rather large battery that is not weak and the connections are good. The regulators are probably original, however. This has not happened over time, it was quite sudden. I will look under the hood for signs of leaking, but wouldnt they leak all the time?
Thanking you for the feedback and hoping for more.
Walt
Thanking you for the feedback and hoping for more.
Walt
06-17-2018, 12:24 PM
#6
Three Wheelin'
Hey Walt, Happy Father’s Day.
I can get a hard start with just sitting.
Traditionally, if I have a big project where she is out of commission for awhile, it’s a going to be a bear to start. Like I need a WOT start to blow out cobwebs.
Other things I guess, in addition to what is posted above: any connection in proximity to the air box if you were changing filter. CPS, MAF, Temp 2.
I can get a hard start with just sitting.
Traditionally, if I have a big project where she is out of commission for awhile, it’s a going to be a bear to start. Like I need a WOT start to blow out cobwebs.
Other things I guess, in addition to what is posted above: any connection in proximity to the air box if you were changing filter. CPS, MAF, Temp 2.
06-17-2018, 12:54 PM
#7
Rennlist Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Hope that helps,
Dave
__________________
David Roberts
2010 Jaguar XKR Coupe - 510HP Stock - Liquid Silver Metallic
928 Owners Club Co-Founder
Rennlist 928 Forum Main Sponsor
www.928gt.com
928 Specialists on Facebook - 928Specialists
Sharks in the Mountains on Facebook - 928SITM
David Roberts
2010 Jaguar XKR Coupe - 510HP Stock - Liquid Silver Metallic
928 Owners Club Co-Founder
Rennlist 928 Forum Main Sponsor
www.928gt.com
928 Specialists on Facebook - 928Specialists
Sharks in the Mountains on Facebook - 928SITM
Trending Topics
06-17-2018, 01:09 PM
#9
Rennlist Member
Thread Starter
Happiest of Fathers Days to you fathers out there. The fuel pump check valve is a possibiity. What about my cold start and thero-time injector / relay? would there still be pressure in my fuel rails overnight if the fuel pump check valve leaked down? Is the check valve a seperate unit (I
cant remember)?
cant remember)?
06-17-2018, 02:19 PM
#11
Team Owner
did you ever inspect the 3 way junction under the right front fender? ,
they snap apart,
this would account for a fuel smell if your fuel lines are good
they snap apart,
this would account for a fuel smell if your fuel lines are good
06-18-2018, 12:06 AM
#13
RL Community Team
Rennlist Member
Rennlist Member
Does this model year have a fuel accumulator in addition to the pump, like my 79 does or is that only on the pre-CIS cars? If so, that could be leaking or clogged up. Mine is in the Passenger side rear fender near the filter.
Also, doesn't just turning the key to the accessory position run the fuel pump for an initial prime - mine does - or again, maybe that's another difference with the early cars.
Also, doesn't just turning the key to the accessory position run the fuel pump for an initial prime - mine does - or again, maybe that's another difference with the early cars.
06-18-2018, 11:52 AM
#14
Rennlist Member
I think he means near the charcoal canister and next to washer res. Remove the wheel well liner. There is a plastic "Y" connector in there that breaks, Roger? has a metal replacement I think.
06-19-2018, 03:39 AM
#15
Rennlist Member
get a cheap pressure gauge...measure fuel pressure at rails. start the car, let it run, check pressure. shut off the engine, watch for pressure to drop. based on what you said, it's likely to drop. if it doesn't, your problem isn't related to the fuel system.