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Originally Posted by Higgs Boson
(Post 302575)
The fact that you have to "give it gas" to get the stumble to clear up is a sign fuel is leaking through the injectors into the cylinders. You actually aren't giving it gas, you are giving it more air to help burn the excess fuel. P1178 often shows up shortly before the fuel pump pukes.
Really?? I had P1178 until I cleaned the MAF. |
Originally Posted by DiscoIIBrandon
(Post 303883)
Touche. And for the most part, I don't need to. However, I'd like to know if I can expect my fuel pump to go or have leaky injectors etc. so I can be proactive rather than get stranded...and obviously I don't want to just fix all possibilities for no reason.
Leaky injectors still seems to be my first guess, but the fuel pressure gauge didn't confirm it as the truck held pressure steady at 37psi after turned off for at least 20 minutes. |
Testies---one, two.....
Originally Posted by Chris-bob
(Post 304039)
But there is no way to know when a fuel pump will fail. There can be symptoms, but they are only educated guesses at best. No point in replacing it if it is working. I'd look elsewhere first if all the gauge readings are within spec.
When pinched the pressure of my old pump only peaked up to 75 psi... with a new and strong pump it will reach well over 100 psi. Do not hold that line pinched for long... I replaced my pump assembly (sweet deal from PT Schram). Whether that was the entire problem solved or not only time and testing will tell. :cool: |
Fuel & Air
Question: if fuel isn't the culprit at warm start-up stumbling...could it be air or lack of?
More specifically: the diaphragm inside of the black cylinder (brake booster?) is clearly worn/torn/not sealing and every time I put pressure on the brakes it sounds like a tire releasing air. I have a replacement on the way to fix this issue anyways, but I'm wondering if that could possibly be the culprit of the stumbling too. I guess we will find out once I get it in...but I'm equally interested in the understanding and diagnosing of these problems. Will report back soon. |
Originally Posted by DiscoIIBrandon
(Post 304198)
Question: if fuel isn't the culprit at warm start-up stumbling...could it be air or lack of?
More specifically: the diaphragm inside of the black cylinder (brake booster?) is clearly worn/torn/not sealing and every time I put pressure on the brakes it sounds like a tire releasing air. I have a replacement on the way to fix this issue anyways, but I'm wondering if that could possibly be the culprit of the stumbling too. I guess we will find out once I get it in...but I'm equally interested in the understanding and diagnosing of these problems. Will report back soon. |
Did you ever figure out the rough idle at warm start?
Have the same issue with a 95.
Originally Posted by DiscoIIBrandon
(Post 300985)
*Updated info*
Have the same issue long story short the car stumbles and stalls sometimes at hot start-up and is running rich. Raw fuel smell sometimes after shutting off, not sure about while starting. I've got a fuel pressure gauge on it and am leaving it on all weekend to keep watch, but here's what I've gotten so far. Hot idle: steady 32 psi Turned off hot: steady 37 psi for at least 20 minutes During stumble at hot start up: steady 32 psi After sitting for a couple hours: currently around 20 psi Cold Start ups: no stumble, starts right up no problem Anything of note from these results? I'm not sure how it could be related, but I think my brake booster diaphragm is toast - because whenever I apply pressure to my brakes it sounds like I'm airing down a tire. Brake's work fine like normal and pedal is normal, doesn't go to floor and isn't stiffer than normal. Any possible relation? Also, I have a tick when warmed up and under load, the tick speed and loudness parallel heat and load (acceleration). DIIB |
Any resolution on this? My 95 just started idling rough and at 500 rpms. Seems to be missing, but im not sure. had to limp to work and haven't been able to get out and inspect, but it sure sounds like your description. I drove 5 minutes this morning, stopped went in to the store, came out, drove to the commissary, and when i came out, some 10 minutes later, it wouldn't start- then when it did start after about 5 minutes of wait, it ran very rough and only at 500 rpms or a little below.
any ideas? I have the coolant temp sensor to replace, but i dont think that is the issue. The only other possibility i've found is fuel injectors, but i am only regurgitating what i've read on this site. thanks, johnny |
Nevermind, i guess. I started it up at lunch and after sitting for 3 hours, everything was back to normal.
Wonder if i flooded it a little when it didn't start up right away. Weird. |
The coolant sensor is a good start. They can effect hot starts. Once you replace that then we'll see what shakes out.
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well, i now have my saturday project!
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