bogging everytime i accelerate!!!
Thread Starter
Instructor
Joined: Sep 2008
Posts: 100
Likes: 0
From: Oak Forest IL
bogging everytime i accelerate!!!
.Still having the same problem with my 90 c4..I changed the fuel pump fuel filter bought fuel injectors from ya, and changed the spark plugs this morning it is still bogging every time i try to accelerate...Im sooooo pissed with this car right now!! please help
Pro
Joined: May 2006
Posts: 637
Likes: 0
AND......... Did you test all the stuff mentioned by some in your previous thread, like TPS, clogged exhaust, stuck IAC, CTS?
Do you have a Service Engine Soon light (that works, I mean)?
If yes, checked for codes/what is your car trying to tell you?
No one on this forum can help if you don´t write what you did and/or what you didn´t test/check.
Do you have a Service Engine Soon light (that works, I mean)?
If yes, checked for codes/what is your car trying to tell you?
No one on this forum can help if you don´t write what you did and/or what you didn´t test/check.
Thread Starter
Instructor
Joined: Sep 2008
Posts: 100
Likes: 0
From: Oak Forest IL
Checked the tps a while ago it was ok, thought about clogged exhaust nothing leading me to that right now iac was ok just scanned it yesterday even though no light was on and there were no codes everything looked pretty normal..it will accelerate but when you go to give more gas just boggs and falls on its face??
Pro
Joined: May 2006
Posts: 637
Likes: 0
If so, could be clogged cat(s).
How did you scan it, do you get a light at ign. on, not running?
And if it´s the car in your avatar you are talking about, then you might want to post this in the ZR1 section...
7th Gear
Joined: Nov 2008
Posts: 7
Likes: 0
Maybe this will help. Had a similiar situation on a 1990 L98 in my street rod. When downshifting from a steady throttle at cruise, she would bog badly. I mean, no power at all. Believe it or not, my charging system was marginal....was only putting out about 11-11.5 volts at steady throttle and would drop below 11 at kickdown. Replaced alternator with new adjustable voltage, quick amperage model and replaced 2 charging circuit connections....presto, problem gone. If you don't drive the vehicle much (like most street rods) and battery charge is boderline, this CAN cause this problem (although several other fuel-related issues like clogged fuel filter and weak fuel pressure come to mind). Computers and fuel injection require a good battery and good connections, as well as a charging rate around 14-14.5 volts to operate properly. If the charging system is anywhere at limp as mine was, you will have a system that cannot possibly meet the increased load requirements under acceleration. Check your voltage at the battery and output at the alternator. Also, check your battery ground. Please let us know what you find...
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Thread Starter
Instructor
Joined: Sep 2008
Posts: 100
Likes: 0
From: Oak Forest IL
I think im gona un bolt it and drop it down to take a peak...Im getin ready to go back out there and do some more trouble shooting....But its acting as if the tps sensor were bad so i dont know....
Melting Slicks
Joined: Jun 2007
Posts: 3,389
Likes: 0
From: Poocakes loves teh sausage! N.E. Ohio
Does it bog if you are sitting in park and rev it? If so mine did that with plugged cats.
Drop the y-pipe and start it in park and rev it. See if there is any change.
Drop the y-pipe and start it in park and rev it. See if there is any change.
Advanced
Joined: Apr 2005
Posts: 81
Likes: 0
From: Ghent ny
how you making out with that?have simular problem,mine starts fine but when you rev it breaks down,ease on the gas it will rev to 2400 rpm after that it just bogs like running on two cylinders but wont stall.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
.
No load on engine when reved in park so dynamics are different to when car is driven.
More info needed
Bogging = engine goes flat and then recovers revs like normal.
Will it rev out eventually or does it max out at a set rpm?
If it starts and idles fine but will not rev under load then almost certain to be blocked cat as mentioned.
Been there.
You can't scan the IAC ; there is no feedback.What you see is the ECM signal SENT to the IAC ; not what it is actually doing.Has no affect off idle anyway.
More info needed
Bogging = engine goes flat and then recovers revs like normal.
Will it rev out eventually or does it max out at a set rpm?
If it starts and idles fine but will not rev under load then almost certain to be blocked cat as mentioned.
Been there.
You can't scan the IAC ; there is no feedback.What you see is the ECM signal SENT to the IAC ; not what it is actually doing.Has no affect off idle anyway.
Last edited by rodj; Mar 21, 2009 at 08:58 AM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
Wires?
I have seen no mention of wires possibly being the problem. Only the
changing of the plugs. When it is completely dark, pop the hood to see if there is "arcing" from the the wires. I had a similar problem weeks ago. I was in the process of checking everything from "bad gas" to a newly replaced fuel pump and fuel regulator, etc. Decided to check the wires early one A. M. — BOOM! It looked like the 4th Of July.
I replaced the wires (my 1st time doing this—whew!), now the '94 is running better than ever. Good Luck.
changing of the plugs. When it is completely dark, pop the hood to see if there is "arcing" from the the wires. I had a similar problem weeks ago. I was in the process of checking everything from "bad gas" to a newly replaced fuel pump and fuel regulator, etc. Decided to check the wires early one A. M. — BOOM! It looked like the 4th Of July.
I replaced the wires (my 1st time doing this—whew!), now the '94 is running better than ever. Good Luck.
Last edited by Donne Trav; Mar 21, 2009 at 12:49 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
I would duck tape a FP gauge to the winshield and observe your pressure when the engine starts to bog.
It sure sounds like classic symptom of clogged cats. What makes you think that your cats are NOT the problem ??
It sure sounds like classic symptom of clogged cats. What makes you think that your cats are NOT the problem ??