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Old 08-29-2018, 10:37 PM   #1
A Zombie
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Default Car wonít start, backfires out of intake. Please help!

Drove my 85 244 to work parked it, when I tried to leave. No start. It cranks fine, it almost starts occasionally but it shakes like crazy and backfires. I hear the fuel pump and fuel pump relay is clicking. Checked the timing marks, they all line up and belt is in tact. With crank pulley lined up with timing mark rotor is pointing to #1 cylinder. Coil lead shows a spark to ground. Lots of fuel sprays out of fuel line when disconnected. Tried plugging and unplugging MAF.

Ether this thing gets crushed in 2 days or it gets fixed.... help!!
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Old 08-29-2018, 10:38 PM   #2
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If anyone in the Seattle area wants it and can pick up this week Iíll sell it for $350 you pick up
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Old 08-30-2018, 01:50 AM   #3
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Did you look at the plugs? They could be fouled from all the starting attempts. The gap could be too large. There is a for sale section if you need it.
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Old 08-30-2018, 02:49 AM   #4
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Could fouled plugs really be enough to bring it to its knees? And why wouldn’t it start in the first place?
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Old 08-30-2018, 11:39 AM   #5
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Does it have a full tank of gas?

I only have $325 and need a full tank to make it home.
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Old 08-30-2018, 11:52 AM   #6
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it's lean if it's popping out the intake, maf would be my guess check to see if the big vacuume line to the brake booster broke
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Old 08-30-2018, 12:41 PM   #7
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I'd say timing belt jumped a tooth if it's backfiring out of the intake.
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Old 08-30-2018, 01:09 PM   #8
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Has the wiring harness been replaced?
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Old 08-30-2018, 01:29 PM   #9
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Quote:
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it's lean if it's popping out the intake, maf would be my guess check to see if the big vacuume line to the brake booster broke
More commonly the cap on the booster check valve pops off and creates a wide open vacuum leak. Engine vacuum will keep it in place until it's shut off which explains why it ran fine until he parked it.
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Old 08-30-2018, 01:52 PM   #10
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Quote:
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I'd say timing belt jumped a tooth if it's backfiring out of the intake.

It looks nice and tight, cam pulley is lined up, canít see the mark on the distributor pulley, but the rotor appears to line up.

If it was the MAF would disconnecting it work, or would it not run that way either.
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Old 08-30-2018, 02:32 PM   #11
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It'll run with the MAF disconnected, just not very well.
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Old 08-30-2018, 03:02 PM   #12
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Put in a a spare MAF I had, no go. No obvious hose out of place. But not showing any real vacuum from the half as test I did this morning. Sadly running out of time... anywhere less obvious to look for a major vacuum leak?
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Old 08-30-2018, 03:05 PM   #13
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Has the wiring harness been replaced?
well?
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Old 08-30-2018, 03:09 PM   #14
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my 1988 240 story pulled up to gas pump car ran great filled up moved car so others could get gas, paid for gas car started ran for a second died than ran so horrible it could hardly be driven popping out the intake had to feather the throttle, thought for sure something major had broke, ran the same with the m.a.f. connected or disconnected, consulted with local Volvo experts, we decided it could be the m.a.f. replaced it and it purred like a kitten, lifetime retired Volvo mechanic said 10 percent of them die like that most m.a.f. failures will just make it run like crap but not rendered it basically undrivable
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Old 08-30-2018, 05:36 PM   #15
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well?
Not that I know of, looks pretty old
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Old 08-30-2018, 05:41 PM   #16
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Found a place to store it... not for sale

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Old 08-30-2018, 06:53 PM   #17
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Old 08-30-2018, 07:30 PM   #18
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Backfiring is lean or ignition timing.
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Old 08-31-2018, 10:58 AM   #19
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Timing belt jumped?
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Old 09-04-2018, 01:11 PM   #20
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roll pin on cam to cam gear is possibly sheared. I had the same symptoms on a car I troubleshooted years ago.
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Old 09-04-2018, 01:22 PM   #21
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If that's it, I have an M cam in Kirkland I'll give you for $3.
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Old 10-13-2018, 09:28 AM   #22
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Would I the cam spin if the roll pin was sheared? Any easy tests without taking the valve cover off?
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Old 10-13-2018, 09:44 AM   #23
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The timing belt is the fuse...... way before a cam gear mechanical failure. Whenever fuel/flame comes out the intake tract, the camshaft timing is wrong w.r.t. crank "home base"....... Pull your cover and find the truth.
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Old 10-13-2018, 10:04 AM   #24
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What was the weather like when it started?

I drove through a biblical downpour several years ago. Everything ran fine on the way home. The trouble started when I went to crank it again. Exact same symptoms your seeing. I dried out the distributor cap, problem solved.
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Old 10-13-2018, 11:53 AM   #25
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I think this is the key clue.

" It cranks fine, it almost starts occasionally but it shakes like crazy and backfires. I hear the fuel pump and fuel pump relay is clicking."

It's likely not getting a steady rpm signal or power/grounds are the problem.
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